If the selector is out of spec, it can push down on the trigger bar which will push up on the Hammer contact which will cause the hammer to bind against the carrier.
|
||||||||||||||||||||||||||||||||||||||
If the selector is out of spec, it can push down on the trigger bar which will push up on the Hammer contact which will cause the hammer to bind against the carrier.
My brother saw Deliverance and bought a Bow. I saw Deliverance and bought an AR-15.
Heavy Metal,
With regards to your comment about the out of spec selector causing hammer drag. Are you suggesting that that is the problem I was having? If so how could that cause the wear on the bolt catch? Would the bolt catch not still be an issue even if the selector was also?
Thanks.
Removed so as to avoid generating bad information.
Last edited by thopkins22; 02-26-10 at 14:52.
folks,
please read
http://www.ar15.com/forums/topic.html?b=3&f=4&t=484476
regarding the cmmg lpk
Hey guys. I know it's been a while since I made the original post but I would like to give an update and show some pictures since I am still having one of the two original issues.
Here is what the jam looks like, shitty picture, I know:
It starts forward but stops after only a small amount of movement. The tip of the round is already starting to feed and is angling slightly up. I shot yesterday and had the same issue. The first round of a fully loaded mag (I used pmags and new BCM mags) would fail to feed. To get it to feed I simply slammed the bottom of the magazine once or twice and it feeds. I have never had a failure to feed once the initial round has fed.
Some photo documentation:
This is the original bolt catch from the DD LPK. I started filing on it at class but you can still see the gouge mark. It got replaced with a G&R bolt catch after the class but the feeding problem persists.
DD mag catch:
Here is the new G&R mag catch after firing roughly 100 rounds (couple days ago) no gouge just a very small amount of surface finish removal:
Here is a pic of the original DD hammer:
Over head shot:
So a quick summery. Built the rifle using DD LPK, went to class, had issues feeding first round of fully loaded mag, had issue with stiffness of safety selector and it's operation with bolt locked back. Got back from class replaced the mag catch and selector with G&R units. Safety selector problems gone. Gun still having issues feeding first round of fully loaded mag (pmags, BCMs). During the last range session the gun started off clean and dripping with Slip 2000.
Thanks in advance for any advice. I have digital calipers and other measuring tools if y'all need exact measurements.
youre not loading the pmags to 31 are you? They actually can fit 31 rounds but its tight and I can imagine that first round causing drag on feeding. That extra play is needed to be able to load a fully loaded 30 round pmag on a closed bolt, a problem USGIs had (military recommended loading to 28 in the past).
Last edited by ForTehNguyen; 09-27-10 at 16:31.
No. 30 rounds, top round is on the right side and you can push it down a little bit. I just unloaded a couple to double check.
EDITED TO ADD:
Not sure if this was in the OP but while at the class the instruction swapped lowers with me (his lower, my upper) and it fed the top round fine. I could feel a difference when releasing the bolt catch on his lower, the gun fed smoother and faster.
Also, this rifle isn't in use, it's just a training rifle. I don't consider it GTG until it gets this bug worked out and goes another 500-1000 trouble free.
Thanks again for any help
Last edited by Serpico1985; 09-27-10 at 16:39.
Last edited by Iraqgunz; 09-27-10 at 17:22.
Owner/Instructor at Semper Paratus Arms
Facebook: https://www.facebook.com/SemperParatusArms/
Semper Paratus Arms AR15 Armorer Course http://www.semperparatusarms.com/cou...-registration/
M4C Misc. Training and Course Announcements- http://www.m4carbine.net/forumdisplay.php?f=141
Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com
Iraqgunz,
Honestly I havent considered that. Thank you sir. I guess I've been assuming it was my error on assembly and/or parts tolerance stacking. But now that you mention that I will defiantly consider it. I would like to exhaust all other avenues first so that I don't pay shipping both ways (easily close to $100) to find out that it was a $5 part. I would defiantly defer to the knowledge base on this forum, if y'all say send it back I'll do so.
Bookmarks