Great Lakes Firearms GL10LA300SSBLK AR-10 300 Win Mag 5+1 24″, Black, 20″ M-Lok Handguard Fixed Hogue OverMolded Stock, A2 Grip, Muzzle Brake
About this product
The Great Lakes Firearms GL10LA300SSBLK AR-10 in 300 Win Mag is a heavy-hitting semi-auto rifle built for shooters who need long-range precision without the hassle of a bolt gun. This model comes with a 24-inch stainless steel barrel, a 20-inch M-Lok handguard, a fixed Hogue OverMolded stock, an A2 grip, and a muzzle brake. At $1199, it delivers a lot of performance for the price.
| Manufacturer | Great Lakes Firearms |
|---|---|
| Model | GL10LA300SSBLK |
| Material | 416R stainless steel barrel, 7075 aluminum billet receiver set |
| Compatibility | AR-10 pattern lower parts kits, triggers, safeties |
| Finish | Black anodized receiver, black oxide gas block, natural stainless barrel |
| Weight | Approximately 9.8 lbs (per manufacturer specs) |
| Condition | New |
Key Features
- 24-inch 416R stainless steel barrel with 5R rifling — Why it matters: The 5R rifling reduces copper fouling and improves accuracy, so you can squeeze tighter groups at longer distances without cleaning as often.
- 20-inch aluminum M-Lok handguard with full-length Picatinny top rail — Why it matters: You can mount bipods, lights, or lasers without extra adapters, and the free-float design keeps barrel harmonics consistent for better precision.
- Hogue OverMolded fixed rifle stock — Why it matters: That rubberized grip soaks up recoil from the 300 Win Mag and gives you a solid cheek weld, so follow-up shots stay fast and comfortable.
- Custom BCG and charging handle — Why it matters: Great Lakes Firearms designed these specifically for the 300 Win Mag pressure curve, which means reliable extraction and chambering even with heavy loads.
- Muzzle brake included (5/8x24 thread) — Why it matters: The brake cuts recoil noticeably, letting you stay on target for quick follow-ups, and the standard thread pattern lets you swap suppressors or compensators easily.
Who It's For
This rifle is for the shooter who wants a semi-auto in 300 Win Mag without spending $2500+. It fits hunters who need ethical reach past 400 yards, target shooters who want to ring steel at 800+, and anyone who appreciates a billet receiver set that feels solid in the hands.
Pros and Cons
- Pro: 5R rifling and free-float handguard help this rifle shoot sub-MOA with good ammunition.
- Pro: Hogue stock is comfortable even with heavy recoiling loads.
- Con: The 5-round magazine is restrictive for competition or rapid fire — you'll want to buy extra mags for range days.
Comparison
| Feature | Great Lakes GL10LA300SSBLK | Geissele Super Duty AR-10 | Lone Wolf Distributors AR-10 |
|---|---|---|---|
| Barrel length | 24 inches | 16 inches | 20 inches |
| Caliber | 300 Win Mag | .308 Winchester | .308 Winchester |
| Receiver material | 7075 billet aluminum | 7075 forged aluminum | 6061 billet aluminum |
| Stock | Hogue OverMolded fixed | Geissele Super 42 buffer tube | Magpul MOE fixed |
| Price | $1199 | $1899 | $999 |
What is the barrel twist rate on the Great Lakes GL10LA300SSBLK?
According to Great Lakes Firearms specs, the 24-inch stainless barrel has a 1:10 twist rate, which stabilizes most 150-200 grain 300 Win Mag bullets well for long-range accuracy.
Does this rifle use standard AR-10 magazines?
No, it uses a proprietary GLFA custom aluminum 5-round magazine. You can buy spares directly from Great Lakes Firearms or through select dealers.
Can I change the stock or grip on this rifle?
Yes. The Hogue OverMolded stock is fixed but uses a standard AR-10 buffer tube, so you can swap to an adjustable stock if you prefer. The A2 grip can be replaced with any AR-10 compatible grip.
What kind of accuracy should I expect?
Many owners report sub-MOA groups at 100 yards with quality match ammunition. The 5R rifling and free-float handguard give it a solid accuracy foundation.
Is this rifle legal in all 50 states?
It ships with a 5-round magazine, so it complies with most state capacity laws. Check your local regulations on 300 Win Mag semi-autos before ordering.
✓ Nationwide delivery (all 50 states)
✓ Ships 1-2 business days
✓ 30-day returns
✓ Secure checkout
See more Semi Auto Rifles and AR-10 Parts. Also check our Long Range Rifles section for similar models.
Over 40% of our long-range customers choose 300 Win Mag for its flat trajectory at 600+ yards. Last updated: April 2026.