Ming the Merciless Posted April 16, 2020 Share Posted April 16, 2020 I hate (NOT!) spending other peoples money, but the MPX is a dirty girl, so I have a spare gas piston, spare gas valve, and a spare bolt. When I clean the gun, I put the clean spares in and drop the dirty parts in the ultrasonic cleaner. Once they are clean, they go in the spares kit in my range bag. If I wasn't so cheap, I would just get a spare MPX.....but then I would have twice as much cleaning to do. Link to comment
Gregg K Posted April 17, 2020 Share Posted April 17, 2020 Did you ever check the orientation of your cam pin? Link to comment
jaredr Posted April 17, 2020 Share Posted April 17, 2020 pondering a copperhead as my next splurge for no good reason, tagging this to see how the story ends Link to comment
ck1 Posted April 17, 2020 Share Posted April 17, 2020 Before you go too crazy trying to track it down, maybe just check the cam-pin, make sure the bolt is slick and the piston is dry, and run a little factory 140ish pf stuff to see what it does..? I treat mine terribly and hardly clean it but I usually run stuff that’d be above 130pf out of a pistol, so probably more like 140-145ish pf... just guessing but I think the hotter stuff might help in blowing crap out of the gas system that might otherwise become an issue... IDK, just any easy one that might be worth a try? Good luck. Link to comment
Bdh821 Posted April 18, 2020 Share Posted April 18, 2020 On 4/16/2020 at 9:19 PM, Gregg K said: Did you ever check the orientation of your cam pin? My MPX has this and I learned the hard way. My gf’s MPX is newer, both are a MPX competition, and her camming pin is ambidextrous. Idk if that’s the right term for it. Now that I think of it a local shooting friends is also ambi. I purchased a backup bolt carrier group I guess you could call it from ILWT. It also has an ambi cam pin Link to comment
Gregg K Posted April 18, 2020 Share Posted April 18, 2020 Maybe they started grinding the notch on both sides of the pin so nobody would have to pay attention Link to comment
Gregg K Posted April 24, 2020 Share Posted April 24, 2020 Nimitz, why do you want to leave us in suspense? Link to comment
Nimitz Posted May 1, 2020 Author Share Posted May 1, 2020 At FL state I had the issues as described, no light strikes, pull the trigger & hear a ‘click’ which I assumed is the hammer falling but nothing. After finally taking it apart & cleaning I took it to the range recently & that’s when it would fire once but not a second time unless I cycled the bolt, this is also where I noticed the bolt not completing closing some times which I know won’t allow the gun to fire. But even after recycling to get the bolt to close it would just fire once. Unfortunately I don’t remember if I checked to see if the bolt was fully closed after it fired. If it was not each time then I agree that’s clearly the problem. I’m going to disable it today & check the gas port and then bring it to the range tomorrow to see where I am. I just cycled the bolt a few times & it fully closes each time now so we’ll see.. I may have to start cleaning the gas port more than every 800 -1,000 rods? Link to comment
Nimitz Posted May 1, 2020 Author Share Posted May 1, 2020 On 4/16/2020 at 9:19 PM, Gregg K said: Did you ever check the orientation of your cam pin? Yes, that’s how I have it as well .... Link to comment
Nimitz Posted May 1, 2020 Author Share Posted May 1, 2020 Appreciate all the feedback guys & Im not ignoring anyone - just others things are taking priority these last few weeks - no shooting since march - can’t actually remember the last time I didn’t Shoot for 4 weeks straight ..... I’m going to check the gas port today, lube the bolt a little more on the outside and then try it tomorrow & report back ... Link to comment
Nimitz Posted May 1, 2020 Author Share Posted May 1, 2020 (edited) Ok, 99% sure what the issue was ... took the gun apart and the gas tappit was basically frozen in the gas port took a soaking in Hopes 9 & a mallet and punch to dislodge ... its currently on my garage floor somewhere luckily I have a spare. Just don’t remember that many rods thru teh gun since teh last time I took teh tappit out ...? One question, does the gas valve need to be disammbled too? Looks like you need some kind of ‘special wrench’ to screw off the face of it? cleaned it all reassembled & lubed - bolt closes freely when charging so we’ll see tomorrow if I can get at least 200 rds out of it since our range has decided to restart matches as of 1 May & the steel match is every 1st Saturday. All sorts of new rules like everyone has to wear a mask and bring cleaner & sanitizer with them to clean after every shooter, etc. we’ll see how much fun it is - might end up postponing more matches until all this >>>>> subsides Edited May 1, 2020 by Nimitz Link to comment
kattman Posted May 1, 2020 Share Posted May 1, 2020 For my MPX's I have switched to the IN LEAD WE TRUST open gas plug, which basically allows open access from the gas port in the barrel to the gas opening in the block where the plug goes in. My pistons come out hard as they need to run dry to make the gun run reliably longer. Running dry seems to go against conventional thought process, however if you lube in there it turns to goo in short order. Found this out the hard way at a USPSA match. I would try one of the open gas plugs to see if it makes a difference. ILWT is a great resource!!! Good luck and stay safe. Link to comment
Nimitz Posted May 4, 2020 Author Share Posted May 4, 2020 gun is now running without issue ... I'll look into those open gas plugs in the mean time, thx! Link to comment
Nathanb Posted May 4, 2020 Share Posted May 4, 2020 (edited) What was your fix? nvm. Cleaned the tappet and piston assembly Edited May 4, 2020 by Nathanb Link to comment
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