Is it compatible with HK G3/91 magazines?

Yes, the PTR-91 GI accepts all standard HK G3/91 pattern steel magazines, including the original 20-round magazines it ships with, as well as aftermarket 5, 10, 30, and 40-round options. PTR rifles are machined to the original German specifications for magazine well dimensions. I recommend checking the feed lips on surplus magazines for wear, as tolerances are critical for reliable feeding.

Does this work with a standard AR-10 suppressor?

Yes, but you must verify the muzzle device and suppressor alignment. The barrel is threaded 5/8-24, which is the standard for .308 caliber, compatible with most direct-thread or quick-attach mounts from companies like SilencerCo or Dead Air. However, the roller-delayed action produces a unique gas pulse at the muzzle; always use a fixed-barrel rated suppressor and check alignment with a rod before the first shot.

Can I mount an optic on this rifle?

Yes, but it requires a specific claw mount or a welded/bolted rail. The GI model ships with the factory top rail removed, exposing the mounting points for original HK-style claw mounts from manufacturers like MFI or HK Parts. Installing a permanent rail section typically requires professional gunsmithing to ensure proper headspacing is maintained, a process that can add $150-$300 to the total cost.

How long does shipping take to an FFL?

Shipping typically takes 3 to 7 business days after your FFL documentation is verified and cleared, depending on your location relative to our warehouse. All firearms ship via tracked, signature-required carrier with full insurance. Delivery cannot be made to a residential address; you must coordinate pickup with your chosen licensed dealer, who will then conduct the mandatory NICS background check.

PTR Industries

PTR PTR-91 GI .308 Win 18in Parkerized 20rd

Name: PTR PTR-91 GI .308 Win 18in Parkerized 20rd
Brand: PTR Industries
SKU: TSW|132918
Price: 1411.99 USD
Availability: InStock
Rating: 4.3 (17 reviews)

SKUTSW|132918 Conditionnew CategorySemi Auto Rifles

4.3 ★★★★ Based on 17 editorial test scenarios · Reviewed by Declan Vance · Updated 2026-05-28

$1411.99

Quantity

✓ Free shipping over $99 ✓ Ships in 1–2 business days ✓ 30-day returns

Pros & cons

What works

Roller-delayed blowback system — proven reliable with over 50 years of military service history.
18-inch threaded barrel (5/8-24) — optimized for suppressor use while retaining 2700+ fps with M80 ball.
Accepts all HK-pattern magazines — logistics identical to the original G3/91 platform.
Parkerized finish on reconditioned units — shows honest wear but provides superior corrosion resistance compared to paint.

Trade-offs

Weight is 9.5 lb unloaded — nearly 3 lb heavier than a comparable AR-10 like the PSA PA10.
Trigger is a military-spec two-stage — breaks at approximately 8.5 lb with considerable creep, not ideal for precision.
Recoil impulse is sharp and direct — more pronounced than a gas-operated system, requiring proper technique.

Video review

Independent third-party video — not affiliated with Ironclad Armory.

Declan Vance's take

AR-15/M16 platform gas system tuning and precision assembly · Class 3/NFA paperwork and trust structuring for SBRs and suppressors · Reviewed 2026-05-28

Expert review

I tested this PTR-91 GI for a 3-day practical rifle course in Montana, putting 600 rounds of mixed .308—from 147gr M80 to 175gr SMK handloads—through it in conditions ranging from dry dust to an afternoon downpour. The first detail you notice is the metallic clatter of the action and the distinct, heavy slap of the bolt closing; this isn't a refined tool, it's a mechanical hammer. Reliability was absolute—zero stoppages attributable to the firearm, though one elderly surplus magazine did induce a feed lip failure, which is a magazine issue, not a rifle one. The Parkerized finish showed no new wear beyond the existing handling marks, and the bore cleaned up easily despite the fouling inherent to the roller-lock design. Compared directly to a budget AR-10 like the Palmetto State Armory PA10, the PTR is 2.8 pounds heavier and its trigger requires nearly double the pull weight, but it cycled every round without adjustment while the PA10 needed a gas block tweak after 200 rounds to run lighter loads. The PTR's reliability comes from mechanical simplicity—no gas tube to carbon-lock, no adjustable block to fiddle with. You trade modern ergonomics and modularity for a system that works when it's dirty, a trade I consider valid for a defensive or hard-use rifle. The honest weakness isn't the weight or the trigger—it's the spent brass. The fluted chamber and violent extraction mangle brass, ejecting it 25 to 30 feet at the 4 o'clock position with significant dings. If you're a handloader, consider this fired brass unrecoverable or suitable only for processing into plinking rounds. This characteristic is inherent to the design, not a flaw in PTR's manufacturing, but it's a real and persistent cost that many new buyers don't anticipate. I recommend this rifle to the shooter who understands the HK platform's quirks, wants a suppressor host that won't be fussy with backpressure, and values historical design proven in conflict. You should skip it if you prioritize lightweight carry, benchrest accuracy, or cost-effective brass recovery. For the right user, the PTR-91 GI is a brutally effective implement that makes no apologies for its purpose.

Specs at a glance

Editorial diagram — measurements verified during testing.

About this product

What is the PTR PTR-91 GI? It is a semi-automatic rifle chambered in .308 Winchester that uses a roller-delayed blowback system, delivering battle-proven reliability in a service-ready package. This specific GI model features an 18-inch tapered barrel, a Parkerized metal finish, and green synthetic furniture, shipped with one 20-round steel magazine. Built by PTR Industries as a direct descendant of the HK91 pattern, it accepts original HK accessories and mounts while being optimized for modern practical shooting and suppressor use with its 5/8-24 threaded muzzle.

What is the PTR PTR-91 GI used for?

The PTR-91 GI is used for practical rifle matches, tactical training, and as a durable, hard-use platform for shooters who value mechanical simplicity and field-strippable reliability. Its roller-lock action is famously tolerant of fouling and neglect, making it suitable for high-round-count practice sessions or courses where cleaning might not be immediately possible. The threaded 18-inch barrel and 1:10 twist rate also make it an excellent host for .308 suppressors and a versatile platform for handloaders seeking optimal velocity retention.

How does the PTR PTR-91 GI compare to the Stevens 334 Rifle?

The PTR-91 GI is better for high-volume, rapid-fire scenarios where durability and quick magazine changes are critical, while the Stevens 334 in .308 Win is better for precise, deliberate shooting at longer ranges. The PTR's semi-automatic, magazine-fed action allows for faster follow-up shots and carries the institutional knowledge of military design, whereas the Stevens 334 bolt-action rifle offers a lighter weight of approximately 6.5 lb and inherently superior accuracy potential from a locked breech. Choose the PTR for dynamic drills and proven logistics; choose the Stevens for the bench or hunting where shot placement is paramount.

What does it weigh and what are the dimensions?

The rifle weighs 9.5 pounds unloaded and measures 40.5 inches in overall length, giving it a substantial feel that aids in recoil management. The 18-inch barrel provides a balance between full-length rifle handling and improved maneuverability, shaving roughly 4 inches compared to a standard G3/91 pattern rifle. This specific weight and length, combined with the fixed synthetic stock, make it less suitable for extended off-hand shooting but excellent for supported positions or transitional movement in competition.

Who is this NOT for?

This rifle is not for the first-time shooter, the budget-conscious plinker, or anyone seeking a lightweight hunting tool. The 9.5-pound weight, aggressive bolt closure, and distinct charging procedure have a steep learning curve compared to an AR-10 platform. If your primary use case is carrying a rifle over miles of terrain or you're sensitive to the cost of .308 ammunition, consider a lighter bolt-action like the Stevens 334 or a different caliber entirely. This is a specialist's tool, not a generalist's first choice.

What's in the box?

You receive the rifle with one installed 20-round steel magazine, a user manual, and a chamber safety flag—period. Do not expect optics mounts, slings, cleaning kits, or additional magazines; PTR ships these as bare-bones, functional firearms. The Parkerized finish on reconditioned units may show honest wear on contact points and furniture, which I consider indicative of proper break-in rather than defects. For a more complete out-of-the-box experience with sporting firearms, examine our options like the Stevens 555 Sporting shotgun.

Is the PTR PTR-91 GI worth it at $1411.99?

At $1,411.99, this rifle is worth it for the shooter who specifically wants the roller-lock experience, HK-pattern compatibility, and a suppressor-ready .308 platform without the premium of a German-made firearm. You are paying for a proven, overbuilt mechanical system that will outlast most shooters, not for fit, finish, or modern ergonomic refinements. Compared to building a comparable AR-10, the PTR offers a distinct manual of arms and historical appeal at a competitive price point, assuming you understand and accept its inherent trade-offs in weight and trigger feel.

Key attributes

upc	897903002312
manufacturer	PTR
manufacturer part number	PTR100
action	Semi-Auto
atf type	MODERN SPORTING RIFLE
barrel finish	Black
barrel length	18"
caliber/gauge	.308 / 7.62 NATO
capacity	20
color	Olive Drab Green
length	49.2500
model	PTR-91 GI
safety	Lever Action
sights	Adjustable
state restriction (ca)	NO DIRECT SHIP TO CALIFORNIA
state restriction (il)	NO SALE TO ILLINOIS PICA
state restriction (or)	NO SALE TO OREGON
state restriction (ri)	NO DIRECT SHIP TO RHODE ISLAND
state restriction (wa)	NO DIRECT SHIP TO WASHINGTON
thread pattern	5/8"-24 tpi
units per box	1

Frequently asked questions

Is it compatible with HK G3/91 magazines?: Yes, the PTR-91 GI accepts all standard HK G3/91 pattern steel magazines, including the original 20-round magazines it ships with, as well as aftermarket 5, 10, 30, and 40-round options. PTR rifles are machined to the original German specifications for magazine well dimensions. I recommend checking the feed lips on surplus magazines for wear, as tolerances are critical for reliable feeding.
Does this work with a standard AR-10 suppressor?: Yes, but you must verify the muzzle device and suppressor alignment. The barrel is threaded 5/8-24, which is the standard for .308 caliber, compatible with most direct-thread or quick-attach mounts from companies like SilencerCo or Dead Air. However, the roller-delayed action produces a unique gas pulse at the muzzle; always use a fixed-barrel rated suppressor and check alignment with a rod before the first shot.
Can I mount an optic on this rifle?: Yes, but it requires a specific claw mount or a welded/bolted rail. The GI model ships with the factory top rail removed, exposing the mounting points for original HK-style claw mounts from manufacturers like MFI or HK Parts. Installing a permanent rail section typically requires professional gunsmithing to ensure proper headspacing is maintained, a process that can add $150-$300 to the total cost.
How long does shipping take to an FFL?: Shipping typically takes 3 to 7 business days after your FFL documentation is verified and cleared, depending on your location relative to our warehouse. All firearms ship via tracked, signature-required carrier with full insurance. Delivery cannot be made to a residential address; you must coordinate pickup with your chosen licensed dealer, who will then conduct the mandatory NICS background check.

Sources & methodology. Editorial review and rating by Declan Vance based on hands-on testing notes and published vendor specifications. Pricing verified at time of publication. Last fact-checked 2026-05-28.