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Building the rear end of an AR-10 or .308 AR usually means chasing down three separate pieces and hoping they all fit together right. The Luth-AR BAP-308 takes that guesswork off the table by handing you the whole rifle-length recoil setup in one box. It's built for A2-style fixed stocks, and it's the kind of no-nonsense part that just works once it's torqued down and ready to run.
Rifle-length buffer systems carry a longer spring and a longer tube than a carbine setup, and that extra travel gives the bolt carrier more room to slow down before it bottoms out. On a .308 that translates to a softer, more drawn-out recoil impulse instead of the sharper snap you get from shorter systems. If you're putting together a precision gun or just want your range sessions to be easier on the shoulder, this is the direction most builders lean. The standard-weight buffer and full-length spring work together to manage that larger cartridge's energy without beating up your rifle.
The extension tube is machined from 6061-T6 aluminum and wears a hardcoat anodized black finish, so it holds up to wear and shrugs off corrosion without adding unnecessary weight. Luth-AR builds these in the USA and cuts the threads to standard dimensions, which means it drops onto quality AR-10 and .308 lowers set up for rifle-length operation. The buffer body assembly runs 5.3 ounces, right in the sweet spot for a standard .308 rifle system.
Keep in mind this is a fixed A2 setup, so it pairs with fixed rifle stocks rather than collapsible ones. If your build already runs a rifle-length gas system, the BAP-308 slots right in and gets you shooting.
The kit includes the rifle-length .308 buttstock extension tube, a standard .308 buffer spring, and a standard buffer body assembly. That covers the internal recoil parts for the rear of your AR-10 lower. You'll still need to supply the fixed stock, castle nut, and the lower receiver itself to finish the build.
No, this is a fixed rifle-length A2 setup, so it's designed for A2-style fixed buttstocks rather than collapsible ones. If you want an adjustable stock, you'll want to look at a carbine-length .308 buffer system instead. The fixed design is what gives you that longer, smoother recoil stroke.
You can, and the kit is set up to do exactly that. Just keep in mind that mixing a rifle-length buffer with a carbine-length gas system can create reliability issues, so it works best when your gas system matches. If your upper is already running rifle-length gas, the BAP-308 is a clean fit.
Yes, the tube threads follow standard dimensions, so it drops onto most quality AR-10 and .308 AR lowers configured for rifle-length operation. Builders have reported clean fitment on billet LR-308 style lowers with no fuss. It's also confirmed to work with platforms like the Aero Precision M5 rifle.
| UPC | 859819007256 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | BAP-308 |
| Product Type | Buffer Tube Complete Assembly |
| Style | Assembly |
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