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I finally got my rifle back from JP in February. They machined a small feed ramp into my upper and polished the underside of the BCG. I have now begun to load test. This rifle does not like longer bullets. 130 Berger’s and 123 Scenars feed perfectly as long as they are seated below 2.80...

Dave Cammack at JP still has my rifle, mags and ammo. I should have feedback after the holidays.

Rifle just arrived at JP today..... I sent them ammo... I am sure that with their expertise they will diagnose the issue and come up with a solution. I own a lot of JP products and can attest that they are top quality. Lets see what they discover. Stay tuned.

Here is the photo of the 2 BCG... JP on the left and DPMS on the right

Rifle was shipped off to Gibbz Arms for testing. They ran Sellior&Bellot and Winchester ammo through with zero issues from all of my magazines. I then sent them Hornady American Gunner and some of my handloads ( Hornady Brass with Berger 130 OTM loaded to magazine length) and they experienced...

Thanks for the feedback.... I have been testing my rifle with factory ammo..... . Had the upper/barrel extension blended and polished by my gunsmith.... tested... and still having the same issue. Also adjusted gas per JP instructions and determined that it is not a gas issue. It appears to...

Thanks.... I'll let you know.

TampaBud.... thanks for the info. I just picked up a few ASC steel magazines... they look similar to the CP mags. I have not tested them yet... but they fit tighter in my magwell and also appear to present the bullet at a better angle than the PMAGS and Lancers that are giving me issues. I...

Thanks for all of the feedback...... I will take some higher res photos with some better lighting. Will also pick up some steel mags and try those to see if they work. Maybe just a little filing and polishing of the junction between the upper and the feed ramps will fix the issue.

Guys... thanks for the replies. The rifle has not functioned correctly from the beginning. I had a few other compatibility issue that have been solved...IE... DiamondHead handgaurd ID to small for JP Heavy Contour barrel, gas block issues etc. I am using the proprietary CAM pin.... I have...

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...