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The Luth-AR MBA-3 takes the guesswork out of finding a comfortable cheek weld. Instead of settling for the fixed geometry of a standard M4 stock, you get a modular buttstock that adjusts to your body and your shooting style. It ships as a complete carbine kit, so everything needed to set up the recoil system on a .223/5.56 AR lower comes in the box.
The standout feature is the 3-axis butt plate. You can tune length of pull, raise or lower the pad, and shift it left or right for a bit of cast to line up your eye behind the optic. On top of that, the cheek rest gives you about an inch of extra height, which matters a lot when you are running a taller scope mount or a red dot on a riser. That kind of adjustability is usually reserved for pricier precision stocks, so having it on a carbine platform is a genuine upgrade over the standard collapsible unit.
Luth-AR molds the MBA-3 from glass-filled nylon, which keeps it tough while trimming weight down to roughly 18 ounces. That is about half of what some comparable stocks weigh, so you feel the difference during a long day at the range or out in the field. One detail worth calling out is the flat-bottom anti-rattle set screw. It snugs the stock against a mil-spec tube and kills that annoying wobble carbine stocks are known for, while also locking your favorite position in place.
There is a Picatinny rail on the bottom rear of the stock body for mounting a monopod when you want extra stability off a bench or in the prone. Molded QD cup pockets sit on both sides to accept Grovtec self-tapping QD cups, which are sold separately, and a bag hook helps steady the rifle over a rear bag. It works with either mil-spec or commercial 6-position carbine buffer tubes, though the included tube is mil-spec diameter.
Yes, this is a complete kit for a .223/5.56 build. It includes the MBA-3 stock, a mil-spec 6-position carbine buffer tube, the carbine buffer, buffer spring, latch plate, and lock ring. You supply the lower receiver and the tools, and you have everything needed to set up the recoil system.
The stock body itself is compatible with both mil-spec and commercial 6-position carbine buffer tubes. This particular kit ships with a mil-spec diameter tube. The flat-bottom anti-rattle set screw is designed to snug the stock onto a mil-spec tube and cut down on wobble.
The cheek rest offers up to about an inch of added height, and the length of pull can be extended roughly an additional inch and a sixteenth. The 3-axis butt plate lets you adjust vertically to match your shoulder pocket and cast left or right about half an inch. Together that lets you build a very personalized cheek weld and fit.
The MBA-3 stock body works across platforms if you pair it with the correct buffer and spring for your caliber, but this specific kit is set up for .223/5.56. Luth-AR does offer dedicated .308 kits with the matching buffer components. Note that these carbine stocks are not intended for large-bore calibers like .338 Lapua or .50 BMG.
| UPC | 859992007418 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MBA-3K-M |
| Color | Black |
| Model | |
| Product Type | Mil-Spec |
| Style | Adjustable |
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