Description
The .243 Winchester has been putting down coyotes and whitetails for decades, and dropping it into an AR-10 platform makes a lot of sense. You get a soft-recoiling, flat-shooting cartridge in a semi-auto that handles follow-up shots without knocking your sight picture loose. Great Lakes Firearms builds this one in Michigan around a 24-inch 416R stainless barrel with a 1:8 twist and 5R rifling, and the barrels are double thermally stress-relieved and air-gauged before they leave the shop. That long tube squeezes every bit of velocity out of the .243, which matters when you are stretching shots across a bean field or a prairie dog town.
What Sets the GL10243SSTNG Apart
The tungsten Cerakote finish over the billet 7075 aluminum upper and lower gives this rifle a sharp two-tone look, and Cerakote holds up to weather and truck-rack abuse far better than a bare finish. Up front, a 20-inch aluminum handguard with a full-length top rail gives you all the real estate you need for a big scope, bipod, and whatever else your setup calls for. The barrel comes threaded 5/8×24 with a muzzle brake installed, which takes the already mild .243 recoil down to nearly nothing. A rifle-length gas system with a .750 gas block keeps the action running smooth, and the mil-spec trigger breaks in the 5.5 to 6 pound range, plenty workable out of the box with room to upgrade later since it accepts standard AR-10 lower parts.
Running the Great Lakes .243 AR-10 in the Field
At 9.3 pounds bare, this is a rifle built for the blind, the bench, or a set of shooting sticks rather than all-day mountain carry, and that weight pays off in stability when it is time to make the shot. The six-position adjustable stock lets you dial in length of pull for heavy winter layers or a growing hunter sharing the rifle. It ships with one 5-round magazine, sized right for hunting, and there are no sights installed, so plan on adding glass. Pair it with a quality variable scope and good ammo, and this thing will earn its keep every season.
Key Specifications
- Manufacturer: Great Lakes Firearms & Ammo
- Model / MPN: GL10243SSTNG
- UPC: 638457792584
- Caliber: .243 Winchester
- Action: Semi-Automatic, Direct Impingement
- Barrel: 24" 416R Stainless Steel, 5R Rifling
- Twist Rate: 1:8
- Muzzle: 5/8×24 Threaded with Muzzle Brake
- Receivers: Billet 7075 Aluminum, Tungsten Cerakote
- Handguard: 20" Aluminum with Full-Length Top Rail
- Gas System: Rifle-Length, .750 Gas Block
- Trigger: Mil-Spec, 5.5-6 lb Pull
- Stock: 6-Position Adjustable
- Capacity: 5+1
- Weight: 9.3 lbs
- Sights: None (Optics Ready)
What’s Included
- Great Lakes GL10243SSTNG AR-10 rifle
- One 5-round detachable magazine
- Pre-installed muzzle brake
Frequently Asked Questions
Does the Great Lakes GL10243SSTNG come with sights or a scope?
No, it ships without sights or optics. The full-length top rail on the receiver and 20-inch handguard gives you plenty of room to mount a scope, and given the long-range potential of a 24-inch .243 barrel, a quality variable power scope is the way to go.
Is .243 Winchester a good caliber for an AR-10?
It's a great fit. The .243 shoots flat, recoils lightly, and handles everything from varmints and coyotes up to deer-sized game. The 1:8 twist on this barrel stabilizes heavier bullets in the 90 to 105 grain range well, which is what you want for deer, while still shooting lighter varmint loads fine.
What magazines does the Great Lakes .243 AR-10 use?
It ships with one 5-round magazine and runs on standard AR-10 pattern magazines since .243 Winchester is based on the .308 case. That means SR-25/DPMS pattern .308 mags will generally feed it, giving you plenty of affordable capacity options for range days.
Can I upgrade the trigger on the GL10243SSTNG?
Yes. The lower accepts standard AR-10 compatible parts including triggers and safeties, so drop-in units and aftermarket trigger groups install just like they would in any DPMS-pattern build. The factory mil-spec trigger breaks around 5.5 to 6 pounds, which is serviceable for hunting right out of the box.



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