TGibe
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Posts posted by TGibe
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On 9/13/2018 at 2:01 PM, Underwood said:
Holds zero no problem after cleaning
Thx!
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23 hours ago, Underwood said:
I have close to 7k threw mine. All original springs, but i break it down and clean it after every use, tappet and gas plug included . I run my Blue Bullet hand loads and white box and have never had 1 malfunction
Do you ever have issues with loosing zero on your optic?
I am new to MPX and recently cleaned tappet & gas plug (after 500 rounds) and zero was fine, but I'm wondering if I need to check zero every single time...?
Thx,
Allen
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On 6/18/2018 at 2:17 PM, Rolex said:
Had the TF 20 round base pad on my MPX 30 round mag- Using my loader put in 49 rounds then it - the loader- came off-
The 50th round went in by placing it on the top round- and with a stout bang on the base pad the round went in.
The mag will not lock in on a closed chamber- with 49 it will-
Functioned just like a factory mag- no feed issues what so ever.
I recommend this base pad- great TF product.
Did you have to do anything special to get 49 rounds in? Did you use the factory spring or one from TF. I can barely get 44 rounds in using the spring provided by TF.
Currently trying to load them up as far as I can, leaving for a couple of days and then unload reload. After 2 cycles I was able to go from 43 to 44.
Thx
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UPDATE: I'm done with the Guard. I bought an MPX and am moving on - it seems to be running fine out of the box with a mixture of PFs from 132 to 155 and OALs from 1.100" to 1.135". no problems with any of my reloads.
I was finally able to get out and do some testing with another shooters mags and ammo. For some reason my ammo wouldn't feed on full mags in either gun and his ammo would feed fine on full mags in both guns and both mags. He was running the red bullets and I am running Montana golds. OAL is pretty much the same. So while I do feel my ammo is the problem I have just lost confidence in the gun - at least for now.
I was able to get it to run reliably with less than 36 rounds loaded. Any more than that and it has problems. So I will probably sell it and let someone else fiddle with the loads. I really like the ease of cleaning vs the MPX and the recoil.
Bottom line: The problem appears to be my reloads, but I have tried PFs from 132 to 155 and OALs from 1.100" to 1.135". I'm thinking it must be the bullet profile or something.
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1 hour ago, cking said:
Her is two things I've done that help, but are no panacea for the problem. Load mags full and let them sit for week to take a set, lots of oil on bolt carrier and into the recoil tube. CMMG support has it problems as you never get to talk with the engineer. But they have been helpful reading off the list of known problems/causes.
Thx. I'm not messing with my existing mags any more as they work 100% in my blowback gun - I've literally never had a problem with them, not once. So I don't think it is the mags, but I will go through the process of using my buddies guard with my mag and my mags in his guard to see what happens. If my mags run fine in his Guard then I know 100% its the gun...
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8 hours ago, cking said:
Any updates? I've got trouble not feeding 33 round Glocks when full, and few failures to eject. CMMG sent me a new extractor which had locking lug shortened.
I'm playing with ejector and extractor tension. I think the extractor looses the rim and the ejector just drives case forward.
After I got it back it still had the same problem. Sent in a slow mo video to CMMG and they thought the bolt was moving too fast so I installed the heaviest weight from their tuning kit with the same problem. I'm still not able to run fully loaded 40 round mags. Been too busy with a new job to meet a friend at the range to swap mags and parts to see what the real issue is. CMMG is trying to work with me, but my use case (USPSA competitive shooter) probably isn't in their roadmap. The CMMG people I talk to are great and they listen and try to help, but the problem is that I ordered the gun for competition last November and still have yet to be able to use it due to reliability issues.
Hopefully I can do some testing with a friend next week, but if I can't get a resolution after that I'm going to buy a Sig MPX as I need something to run that will have less recoil than my blowback gun.
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17 minutes ago, BartCarter said:
Seems to me that the gun runs right with factory mags and the 41 round mag does not feed properly. If this is the case, I would look at what needs to be changed in the 41 round mag to make it feed like the factory mags.
Since I shoot for the love of shooting, I use factory mags and reload if needed. I actually love the reloading part and even starting unloaded. Makes me a better all-around student-of-the-gun.
Yup. Really trying to find out why the 41 round mags work 100% (not 99.99999% - I've actually NEVER had a failure) in my $600 PSA gun, but not in the more expensive CMMG.
I love competing and can't be competitive if I have to reload during a stage and all other competitors don't have to.
I chose this gun because I didn't want to go the Sig MPX route. Right now, I'm wishing I had. LOL
Seriously though, I do appreciate you taking the time to comment. Any frustration you notice in my reply isn't directed at anyone on this forum (especially you), because everyone is super helpful and supportive as I work through this. It's just that I ordered this gun last November and have sent it back twice for two other problems (which have been fixed) and now I'm facing a third problem... Right now it's a paperweight to me because I only plan to shoot it in competition... LOL - definitely a first world problem.
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I’m still having fail to feed on fully loaded 41 round mags. Tried all weights without any change. Tried different power factor loads, OAL, etc. Have sent it back twice now... once mag is downloaded to around 34-35 rounds runs fine.
I have a friend with a guard guard and now I need to meet up with him and swap mags, etc to see if it’s mags or the gun.
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I don’t have hearing aids yet, but I will need them at some point. I love my sordin supreme muffs, but don’t love using them with long guns. I have molded plugs and like shooting with them but can’t hear Range commands well with them in. So I tend the partially remove one and often forget the replug which is really bad.
I have tried non molded electronics (soundgear and walkers) but they just don’t seal well in my ears.
So I’m biting the bullet and spending the $1,500 on custom fits - likely the pro ears pro fit line.
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Quick Update: Complete rifle shipped back to CMMG to see if they can figure out what's going on. Left my hyperfire trigger and ambi safety installed in the off chance that has something to do with it (but I doubt it). Anyway, super nice folks to deal with, but I hope this gets corrected once and for all this time.
Fingers crossed...
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20 minutes ago, BartCarter said:
Would be good to know about this "maybe" issue, as I want to be able to use different kinds of bullets, like HP, etc.
I haven't seen this issue reported on any forums yet.
I had a friend with the Colt CMMG that was having some problems. He sent it to them and when he got it back there were no more problems.
He didn't go into details and I didn't press.
I will post the results. It's been a long journey for me, but I hold out hope for a good resolution.
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Called CMMG and my OAL should be good. Said pretty much if it fits in a glock mag then the guard should eat it up. Sent them the pic and they said this issue "may" be similar to one they discovered and are working on.
It's really nice to be able to talk with folks that are willing to listen to someone who wants to run a gun in competition and doesn't just give you the "run it stock with factory ammo" line.
Cheers,
Allen
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2 minutes ago, BartCarter said:
My factory Guard ran perfectly from day one with no break-in.
The Guard that I built ran perfectly after I clearanced my non-Guard upper ejection port to the Guard factory clearances.
How does the Guard run on factory ammo? If there is a problem there, the CMMG warranty is excellent.
Thanks Bart. What OAL and bullet are you running?
33 rounds and below function fine, but I need more testing time to be sure. 37ish and above rounds fail consistently as shown above (could be resistance or bullet angle under spring pressure). Even releasing locked bolt on a full 40 round mag is inconsistent.
Will try loading some dummy rounds for bolt locked release testing at home. Also will take a box of factory 9mm to test in fully loaded mags.
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11 hours ago, cking said:
Is this running glock mags? My ammo runs 1.15, and it will rip them just fine when stuffed with 33. Standard spring and carbine buffer, the hydraulic blietz buffer works too. Try single round and see if it locks back, if not cut coils till it does.
Thx. Yes - real glock mags that run perfectly in my blowback PCC. Would rather fix the problem with ammo or the gun than modify working mags...
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Terrible day at the range today. Couldn't get the guard to feed properly. I increased my powder charge to see how it would perform with stock spring, but on full 31 round mags with TF +10's it would not feed worth a crap. Also tried my MBX mega with the same problems. Once the mags were downloaded to 30ish they seemed to feed OK. Both mags function full (I only load to minus 1 from max) flawlessly in my blowback PCC.
I've attached a picture of the malfunction (yeah, i removed the dust cover). The tip of the bullet is dented, which likely means its hitting the top of the chamber. The rim of the case is getting also mangled\chopped away by the bolt lugs.
Any ideas?
Could it be my OAL of 1.130-1.135"?
What is everyone else running for OAL?
Unfortunately I got a call that my daughter was heading to the ER and had to cut my range time short before I could even trouble shoot the problems. She's fine now, but it kept me from figuring out what happened.
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On 2/12/2018 at 4:24 PM, BartCarter said:
My 9 mm Guard's buffer is 2.93 oz and the BCG is 11.78 oz.
I weighed my buffer and it is also just under 3 oz.
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13 minutes ago, bwikel said:
I don't have a complete guard I built with the bolt barrel combo. I have run buffers from 1 to 4 oz and a standard carbine spring.
Thanks! That's exactly the info I was looking for.
The CMMG lower comes stock with a heavy buffer and heavy spring. I will try a standard carbine spring and 4oz buffer - I bet it will run fine like that with lower PF loads.
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1 hour ago, Tampa-XD45 said:
Keep us updated after you run 500 rounds through it. I have some interest in the Guard ... but I have no interest in having to "tune" a $1,000+ AR9.
I think for standard ammo there isn’t any tuning required. Just us shooters looking to tweak for competition.
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8 minutes ago, bwikel said:
I dont know that break in is as much of the issue as the buffer weight. I am running a lighter buffer to get 130pf 147 gr and 124 gr ammo to run 100%.
Thx. What buffer weight are you running? Did you also change out the spring?
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30 minutes ago, L9X25 said:
Do you have an update on what happened, or what they are did to fix it?
I have been thrilled with my NFA side charging upper, so I decided to build a matching NFA lower to let me put my JP back together.
I ordered all of the parts and everything seemingly went together fine. Snap it all together and cycle the bolt ... and the bolt gets stuck in the buffer tube. I apply some torque, as if trying to bend the rifle in half, and the bolt snaps closed. If I hold torque on the buffer tube, everything cycles smoothly, but if I release the tension, the bolt binds and locks up. It was too late for me to do more testing, but I intend to swap over the buffer tube from the JP and see if one tube is threaded crooked, or if the lower is threaded crooked.
Any ideas?
I would remove and reinstall. Maybe try another tube if you have one.
They said the buffer tube was misaligned and they removed it, reinstalled it, and test fired it. They said they don’t measure every lower on their jig. It is perfect now. I didn’t have tools and was concerned that the receiver was out of spec and relieved that it wasn’t.
Now it need to work on a softer spring and lighter buffer so I can run 130-135 pf loads. Currently it needs 150+ to cycle fully.
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7 hours ago, StealthyBlagga said:
I am told the Guard needs at least 500 rounds through it - presumably to break in the locking lug-barrel extension interface. Run 500 of a hotter load, then circle back and see if it will run the lighter stuff.
I had heard this and forgotten. I will put some more rounds through it and test again. Thx.
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1 hour ago, NickBlasta said:
Mine likes normal power stuff, like 135-140pf (out of a handgun). When I use my powderpuff loads it doesn't run as well. IMO the snappy loads are less dot disruption too.
Thanks Nick. I developed this load for my blowback PCC and when I chrono'd it in a G17 it barely made 125PF. LOL
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34 minutes ago, MikieM said:
Your 1100 FPS loads are at 136 PF, and should be just fine. 1015 FPS is your threshold for that weight bullet.
I personally know very little about the Guard. According to what I have read it utilizes a delayed blowback that slows the bolt/buffer as it comes out of battery which in turn allows the use of a lighter bolt/buffer assembly.
My opinion is that the good folks at CMMG have got the bolt/buffer mass (weight) correct. That being the case I would suggest you try out a couple of different springs and see what works best.
I would suggest you visit Blitzkrieg Components website and check out their selection of buffer springs. Start with the softest and work your way up, or at least get one that is weaker than the one you have. It's my guess that it's a bit too stiff.
Thx. I think they have it perfect for normal commercial ammo. I have some springs and weights to try out and am hoping to document what owners have done to get it tuned for minor PF loads.
Cheers!
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I'm looking to use my lower power factor loads (124gr projectiles at 1100fps) but it isn't cycling the bolt well enough to eject rounds reliably). Cycling seems reliable at 1200fps... I would really like a 130-140PF load to run reliably...
What are USPSA shooters doing to the Guard 9mm to allow them to run reliably at lower PFs?
Has anyone replaced the stock buffer and spring in the 9mm guard?
Or are folks just running hotter loads?
Thanks much!
MPX Maintenance Schedule
in Pistol Caliber Carbine
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Looks great! Do most use simple green or something specifically for gun part cleaning like the Lyman stuff?