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The Luth-AR BS-11 is a rifle-length buffer built for AR-15s wearing an A2 fixed stock. At 5.1 ounces, it sits right in the sweet spot for rifle-length systems, using five steel weights inside the housing to slow the bolt carrier down just enough to take the edge off recoil and keep bolt bounce in check. If you've got a classic 20-inch A2, a service rifle build, or any fixed-stock setup running a rifle-length receiver extension, this is the buffer that platform was designed around.
When a round goes off, gas drives your bolt carrier group rearward until it meets the buffer. The BS-11's mass and its internal weights absorb that energy, then the spring sends everything back forward to strip and chamber the next round. That extra weight compared to a carbine buffer means a slower, softer cycle, which translates to a smoother shooting impulse, gentler extraction, and less pounding on the back of your receiver extension. It's a simple part, but it's doing a lot of work every time you pull the trigger.
This one is rifle-length only. It's longer than a carbine buffer and is meant to live inside an A1 or A2 rifle buffer tube paired with a rifle-length spring. Dropping it into a carbine or pistol tube won't work right and can cause function issues, so if you're running a collapsible stock, you'll want a carbine buffer or an A5 setup instead. For A2 and A4 style rifles with fixed buttstocks, it's a direct-fit replacement with no fiddling required.
Randy Luth has been in the AR game for close to four decades, going back to his days founding DPMS, and the parts carrying his name reflect that experience. The BS-11 is made in America and covered by the Luth-AR warranty, so whether you're replacing a worn buffer or finishing off a fresh build, you're getting a proven piece for a proven platform.
No. The BS-11 is a rifle-length buffer and only fits rifle-length receiver extensions paired with A1 or A2 fixed stocks. It's physically longer than a carbine buffer and won't cycle correctly in a carbine or pistol tube. If you're running a collapsible stock, you'll want a carbine buffer or an A5 system instead.
It's designed for AR-15s in .223 Remington or 5.56 NATO running a rifle-length buffer tube with a fixed A2 or A4 stock. Think classic 20-inch rifles, service rifle builds, and precision setups that use the longer buffer travel. The extra weight and length give you a smoother, softer recoil impulse than a carbine setup.
The BS-11 comes in around 5.1 ounces, which is right where rifle-length buffers typically land. That mass slows the bolt carrier during the cycle, which softens felt recoil, reduces bolt bounce, and eases extraction. Rifle buffers use five steel weights inside the housing to reach that number rather than tungsten.
Yes. For A2 and A4 style rifles with fixed buttstocks and rifle-length tubes, it drops in as a straight swap with no modifications. It's a good pick whether you're refreshing an older buffer or completing a new rifle-length build.
| UPC | 859819007164 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | BS-11 |
| Product Type | Buffer |
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