it is built on a 700 Remington. I had a gunsmith Clay Spencer in Charlottesville VA build it for me. I use the AI mags, and it feeds fine. I add to adjust the lips on the magazine, but after that no issues at all. The magazine opening was too tight, so the round was not up high enough for the bolt to push it forward consistently. it is very accurate to, I have shoot a couple 1/2" 200 yard groups with it. I shoot in 4 matches last year shooting berger bullets, but they have been tough to find, so I may try some Sierras.