Jump to content
Brian Enos's Forums... Maku mozo!

MickB

Classifieds
 View Profile  See their activity

  • Posts

    981

  • Joined

  • Last visited

 Content Type 

Posts posted by MickB

    Double Feeds

    in Pistol Caliber Carbine

    Posted

    First check that the mag springs are not in backwards. 

    Also what is your double feed? One empty and one live round or two live rounds?

    mag blocks are extremely sensitive to position in the magwell for feed reliability. 

     

    Mick

    which gun for pcc

    in Pistol Caliber Carbine

    Posted

    3 hours ago, 1911luvr said:


    If you look at what I wrote, I said one of the 6 runs reliably. Those 5 that do not all have the same set of problems- double feeds or followers that get stuck. I've seen it with the ASC 20s and 32s, but not 10s. I've seen the same problem with another brand but can't remember the name. I've tried tuning the feed lips to match original spec, checked the tubes for burs, smoothed the followers, but they were still unreliable. It doesn't much matter anymore, because of the 5 one switched to a Sig MPX, another the JP, another a Glock lower, and the other 2 seem to have given up on them as I haven't seen them shoot PCC in a long time.

    I don't have any problems with my ETS mags. I can feed almost everything from 100gr to 160gr. I say almost everything because 125gr truncated cone coated rounds used to have a feed issue with my old barrel, but seem to be fine with this one. The only real feed problem I've have was with a brand new factory Glock mag which had a manufacturing defect, but others have been fine. Maybe I'm in the minority with my ETS mag reliability, but that's been my experience. As I think back about it, in my last 6 steel challenge and USPSA shoots the only issue I've seen has been projectiles stuck in the lands when trying to eject/show clear, and brass separations- neither of which are attributed to the lower.

    ASC mags is a clue. ASC is the old C-Products. 

    OEM for Colt is Metalform. For a brief period Colt tried using C-Products/ASC but quickly went back to Metalform for reliability reasons. 

    As Tim also mentioned the other FTF issues in the Colt system is the feed cone of the barrel entering the chamber. Barrels with insufficient angle or sharp edges will cause the incoming round to hang up on the way into the chamber or even worse, drive the projectile into the case. Not all PCC barrels, bolts, and lowers are created equal as people are finding out.

     

    Mick

    which gun for pcc

    in Pistol Caliber Carbine

    Posted · Edited by MickB

    1 hour ago, BD Williamson said:

    Well thats really interesting Mick as I bought the lower in the pic yesterday. Maybe they realized they needed back in there now???

    Colt pattern lowers have always had the feed ramp in place due to the feed angle of the magazine used. This style lower has been around since the very beginning. Glock pattern lowers came way later.  The feed angle of glock pattern lowers is also different to that of Colt pattern. 

    Since you now have a Colt pattern lower I would suggest you stick to Metalform manufacture mags like those from Brownells or PSA. The mag in your picture looks like an ASC or C-Products mag (orange follower) which are not the most reliable.

     

    Mick

    which gun for pcc

    in Pistol Caliber Carbine

    Posted

    9 hours ago, BD Williamson said:

    I wish I had done more research on the Colt lowers as if your look at the lowers from QC10 they have built in feed ramps which I would think should solve the feeding issues that all the Glock lowers seem to have. Now if we can get the barrel manufacturers to throat the barrels a bit more!!

    colt.jpg

    Early QC10 glock lowers used to come with a feed ramp. One thing to remember is that QC10 were the original developer of the glock mag pattern AR9 lower receiver (QC10 used to be the company known as DDLES before they were taken over and renamed QC10). The point is that they have been doing the glock pattern lower longer than anyone else. QC10 eliminated the feed ramp in their glock lower for the simple reason that as the cartridge is stripped from the mag, the nose of the round actually enters the chamber while the rear of the cartridge is still held by the magazine feed lips, meaning that in the QC10 glock lower the feed ramp was not needed. 

    Try it with a dummy round and you'll see. 

    Mag well placement in the lower is the key. 

    I cannot comment on other brands of glock pattern lowers but my bet is that those that are having issues with feeding are experiencing "bullet jump" where the round has left contact with the mag feed lips before the round has entered the chamber or the angle of the magazine is such that the round takes a slight nose dive during feeding, which is what a feed ramp would help to cure. 

     

    Mick

    2017 Superstition Mountain Mystery 3-Gun

    in Multi-Gun, Rifle & Shotgun Match Announcements

    Posted

    Long time SMM3G Sponsor, Brownell's, is giving away two spots to SMM3G 2017. Simply go to Brownell's Facebook page and find the SMM3G announcement and put "I'M IN" under the comments section. Winners will be selected via random draw by Brownell's on January 30. This is a drawing for Match entry only. Winners will have to provide their own transportation, accommodation and equipment for the match.

    If you weren't able to get into SMM3G, here is another opportunity for 2 people.

    Carbine buffer selection

    in Pistol Caliber Carbine

    Posted

    5.5oz is Colt 9mm SMG spec and the latest versions come with a spacer at the rear of the buffer spring.

    However, the gun will shoot flatter if you go with a heavier buffer. The VLTOR A5H4 is 6.8oz and the correct length inside a carbine buffer tube to eliminate the need for spacers or a stack of quarters. Testing side by side with the factory Colt buffer system and the VLTOR A5H4 cuts dot bounce roughly in half.

    Combining the A5H4 buffer with a Tubb .308 flat wire spring gives even less muzzle rise....

    Mick

    PCC AR 9mm barrel makers?

    in Pistol Caliber Carbine

    Posted · Edited by MickB

    2 hours ago, MikeRush said:

    Are they recent purchases? I have a Ballistic Advantage 11" and had a 16" Faxon and bullets loaded to 1.11 would hit the rifling in both.

    I might just have to buy a stainless barrel and have it chopped, threaded, and turned to what I want.

    I have one of the first run of the 8.5" barrels. I am loading to 1.15" OAL using Precision Delta 124gr FMJ and have never had an issue.

    Are you using hollow points by chance? Had a buddy that loaded to same OAL as his FMJ loads and he was getting his rounds hit the rifling in his JP PCC barrel.

    Muzzle break on mpx?

    in Pistol Caliber Carbine

    Posted

    14 hours ago, MickB said:

    Fortis also makes a 9mm muzzle brake in both 1/2x28" and 1/2x36" thread patterns...

    JP also makes a brake in 1/2x36" thread pattern

    I have no idea how well they work

    Mick

    Sorry folks. The only Lantac 9mm brake that I was aware of was the one with 1/2x36" thread pattern, which is the US standard for 9mm rifle/subgun barrels.

    Maybe SIG will change the thread pattern like CZ is doing on their PCC?

     

    Mick

    death jams while loading AR9 with bolt closed

    in Rifle - Technical

    Posted

    Before you do anything, check your ejector. With the upper off, insert a loaded mag.

    Are the rounds hitting the ejector (wiggle it around and see if contact with the rounds can be made)? If so, you need to replace or modify the ejector.

    An ejector issue could explain why the gun works from an open bolt (mag forces the ejector to an out of the way position) and not on a closed bolt.

     

    Mick

    Let's talk about different gas lengths with adjustable gas blocks

    in Rifle - Technical

    Posted

    23 hours ago, kurtm said:

    Max, you need to spend a bit more time on gas laws and how plasma flow. Pressure is pressure. Think about a garden hose. It is flowing at around 40 psi. When you put your thumb over the end the water squirts farther. Did you increase the pressure in the hose? If you answer yes you need to spend a lot more time studying! There is no way putting your thumb over the end changes the pressure, think about the 12" water main that supplies the water to your house.....do you really think that by putting you thumb over the end of your hose it increases the pressure of that?? What you have done is changed the velocity that the water flows at, not the pressure.....now think about that!!!! Port pressure!!! Now don't  think, just drink! ;)

    So, in the case of a carbine gas system, if the aim is to reduce pressure at the bolt, would not a bleed off gas block like the Superlative Arms or the bleed off adjustable bolt carrier like those from 2A or Bootleg be a better mouse trap?

    Mick

    Uzi mag extension

    in Rifle - Technical

    Posted

    On ‎8‎/‎10‎/‎2016 at 2:24 PM, bmiller said:

    Thank you for posting that link! I absolutely agree that was pure genius. I hope stealthy chimes in with an update on how that mag has been holding together.

    Mick

    Colt 'C' semi carrier as a poor mans LMOS?

    in Rifle - Technical

    Posted

    You will not save much weight using the Colt half circle carrier. They are barely lighter than the standard carrier.

    There are 2 kinds of half circle Colt carrier.

    Half circle with non-shrouded firing pin (SP1 type)

    Half circle with M16 shrouded firing pin (this is the so called Law Enforcement semi auto carrier that came in ban era LEO guns) - I run one of these in my Limited guns.

    Mick

×
×
  • Create New...