i run a full-length solid rod in mine with no problems, but NO BUFFER- i have about 40 magazines- some usgi, some wilson( exactly 2) and some south american 5 buck specials- these came niw in either blue or chrome( you don't get stainless at that price) and, about half didn't work, or got "caught " in the frame- they're SUPPOSED to drop free when you hit the button- i swapped bodies , springs and followers back and forth, and turned the springs round on some- that got me another 12 - and i broke the rest in using just a frame and no barrel- now they ALL work, all the time