Assembled a 9 mm RR 15. Only firing as a single shot. Will not cycle the action. Everything moves freely when operating the charging handle. Only thing that is odd to me is when the upper is off the lower or tipped up from pulling the back pin the bolt carrier will slider backward extending out of the rear of the upper. The spring and buffer hold it from doing this when the upper is installed on the lower. No gas tube on the 9’s. It’s the buffer to heavy or is there something wrong or missing on the bolt carrier. (Slides freely no latch tension when not on the lower.
Colt mag adapter ( fit in nice)
9 mm upper and bcg from AR15 Parts.com.
Stoner buffer tube
9 mm buffer 8.2 oz
115gr. fmj 9 mm target ammo.
Any help would be great.
