Quick answer: For most builds, a collapsible stock with an anti-rattle lock is the sweet spot: the FAB Defense GLR-16 or the GL-SHOCK if you want softer recoil and battery storage. Going compact for close quarters? GL-CORE S. Building a precision rifle? RAPS. First, check whether your buffer tube is mil-spec or commercial.
The factory stock on most ARs is fine the way a gas station sandwich is fine. It works. You can do better.
Before You Buy: Mil-Spec or Commercial Tube?
Your stock slides onto the buffer tube (the round tube behind the receiver). There are two common sizes: mil-spec (slightly smaller outside diameter) and commercial. A stock made for one wobbles or won't fit on the other. Every stock below says which it fits; most FAB Defense stocks fit both.
Our Picks
| Stock | Best for | Fits |
|---|---|---|
| FAB Defense GLR-16 | All-rounder, no rattle, storage | Mil-spec and commercial |
| FAB Defense GL-SHOCK | Softer recoil, battery storage | Mil-spec and commercial |
| FAB Defense GL-CORE IMPACT | Three-setting recoil reduction | Mil-spec and commercial |
| FAB Defense GL-CORE S | Short CQB length, armor friendly | AR-15/M4, AR-10, AK with tube |
| FAB Defense GL-CORE M | A spare 10-round mag hidden in the stock | Mil-spec and commercial |
| FAB Defense RAPS | Precision builds, one-hand adjustment | AR-15 / AR-10 |
| CAA CBS | Budget, side rail for a cheek piece | Commercial |
Best All-Rounder: FAB Defense GLR-16
Patented anti-rattle lock, a built-in storage compartment, three sling points and your choice of no riser, a fixed riser or a Picatinny cheek riser.
Why we like it: it fixes the two classic AR stock complaints, wobble and nowhere to put stuff, without getting fancy.
Softer Recoil: GL-SHOCK and GL-CORE IMPACT
The GL-SHOCK builds shock absorption into the stock, adds an anti-rattle lock and a water-resistant compartment for two CR123 or AA batteries (handy for your optic and light). The GL-CORE IMPACT goes further with three recoil settings; FAB rates it at up to 50% less felt recoil.
Compact for Close Quarters: GL-CORE S
Short CQB length, a flat rubber pad that sits well against body armor, two QD sockets and nothing sticking out to snag. It also fits AR-10s and AKs that use a buffer tube.
Carry a Spare Mag in the Stock: GL-CORE M and GL-MAG 5R
The GL-CORE M hides one 10-round 5.56 magazine inside the stock and ships with a 10-round ULTIMAG. Want it smaller? The GL-MAG 5R carries a 5-rounder. Check your local capacity rules.
For Precision Rifles: FAB Defense RAPS
One lever (1Latch) unlocks both the cheek rest and the length of pull, so you adjust with one hand. 42 mm of cheek-rest travel and length-of-pull memory.
Pros and Cons of Upgrading Your Stock
- Pros: better cheek weld (where your face rests on the stock), less wobble, storage, sling points where you want them.
- Cons: you have to know your tube size; precision stocks add weight.
Who a fancy stock is NOT for: a light, handy carbine you just want to keep simple. The GLR-16 or GL-CORE will do.
Finish the rifle with a grip and a handguard: see the best FAB Defense AR-15 upgrades, or browse all AR-15 gear.
FAQ
Will an AR-15 stock fit my rifle?
Check your buffer tube: mil-spec or commercial. Most FAB Defense stocks here fit both; the CAA CBS fits commercial tubes.
What is the best AR-15 stock for recoil?
The FAB Defense GL-CORE IMPACT has three recoil settings (FAB rates it at up to 50% less felt recoil), and the GL-SHOCK has built-in shock absorption.
Which AR-15 stock is best for body armor?
A flat butt pad works best with armor: the GL-CORE and GL-CORE S both have one.
Can a stock carry a spare magazine?
Yes. The GL-CORE M holds a 10-round 5.56 magazine and the GL-MAG 5R a 5-round magazine, both included.
Do I need a gunsmith to change my stock?
No. Most AR-15 stocks slide onto the existing buffer tube.
The Bottom Line
Start with the GLR-16 or GL-SHOCK, go GL-CORE S for compact, and RAPS when you build for precision. Just match your buffer tube first.
