I have built a DPMS patern side charging AR-10 in 6.5 creedmoor with top quality parts and cannot get it to function correctly.... reaching out to the forum for advice. The build is on a matched Gibbz G10 side charging upper/lower receiver. Operating system and barrel are all JP Enterprises. Trigger is Geissle SD-E 2 stage trigger. DiamondHead Handguard. Luth-Ar stock. Kryptek Camo paint job. I have tried Magpul and Lancer magazines.
I have worked through all of the function issues... gas system, bolt hold back, barrel contact with handguard issues etc.
I continue to have a problem whereby rounds will not feed smoothly onto the feed ramps of the JP barrel extension. A few rounds will feed and then either one from the left or one from the right side will nose dive directly into the flat spot that is between the top of the magazine and the bottom edge of the feed ramps. Essentially the cartridge gets wedged between the bold face and the barrel extension. Like any AR platform the magazines wiggle a bit and move up a and down slightly..... this is just enough to cause the feeding issues.
I am not sure if the feed ramps milled into the barrel extension are machined incorrectly, or is the lower receiver out of spec and causing the magazines to sit too low, or is the upper receiver milled a bit off and not seating the barrel in the right location to allow the feed ramps to meet up with the magazine at the right height.
Check out the attached photos and let me know your thoughts on how to fix this issue. I have a couple of thousand $$ into this rifle and its driving me crazy getting it to function.
Link to Misfeed photos