2010年12月3日 · I just built an AR57 that has an 11" barrel, RRA multi caliber pistol lower and installed the supplied AR57 buffer. I haven't fired it yet. I know it takes some work to get a short buffers to work right in AR pistols chambered in .223 and would like to know what's the shortest buffer I can put on this that won't compromise it's function.

2022年3月3日 · After running a test this past weekend, I now fully believe a standard carbine length buffer will work. I also believe a heavier buffer will be better than the 4.8oz buffer. The first rounds from my Panzer AR57 had shoulders that were pushed out, making me think the cases were extracting too quickly, allowing the high pressure to push the ...

These AR57 parts will let you start a 5.7 build, capitalizing on the AR platform while using the amazing 5.7 cartridge. These FN 5.7 x28 AR parts let you build a pistol, a carbine or an SBR with the appropriate tax stamp. All the FN Five Seven parts meet the exacting standards Right To Bear demands of all its suppliers. Why 5.7?

2010年4月25日 · I have the carbine AR57 buffer with my 6 point adj stock. I got the right buffer and buffer tube and all. I know I have the standard RRA trigger with hammer and spring. According to AR57center they haven't had problems with that setup. I still ordered a heavier duty hammer spring and when I hear from 57center on my bolt I should know more.

2023年11月18日 · I want to use the same lower that came with my 5.56 for both uppers until I can buy a new pistol liwer for the 12 in barreled ar 57. No, at a minimum you need a 9mm buffer or the one that came with your upper. It should have came with your upper.

2010年3月18日 · I just bought an AR57 upper which came with a carbine buffer. I'd like to use an A2 stock, can I use either a standard A2 buffer or the special carbine buffer that came with the upper? I'm trying not to spend an extra $50 for the special rifle length buffer.

2024年2月28日 · The AR57 ULT Complete Upper Assembly boasts several impressive features that make it stand out from other options on the market: 5.7x28mm with 12″ Lightweight Barrel and M-LOK Rails: The 12-inch lightweight barrel enhances maneuverability while providing optimal accuracy.

2012年10月2日 · I used a standard AR-15 carbine spring, and the buffer that came with the AR-57 upper. The rifle is a blast to shoot. Just enough recoil to let you know you're shooting a rifle, tremendously accurate and flawless action.

2023年8月29日 · Too light a buffer or spring can keep the bolt from full seating and can cause it to move too early during the firing cycle. QC was a huge issues with the AR57 units (gen 1-3) and the few I’ve handled of the Panzer (gen 4) seem to have corrected some of this.