Is it compatible with HK91/G3 parts?

Yes, the PTR-91 GIRK has extensive parts compatibility with the HK91/G3 pattern. Stocks, pistol grips, handguards, and most internal components from compatible HK-pattern rifles will generally interchange, though fitting may be required. PTR uses US-made barrels and receivers but maintains the original roller-lock blueprint for this interchangeability.

Does it fit standard .308 AR-10 magazines?

No, it does not. The PTR-91 uses proprietary HK-pattern steel magazines. You must source HK91, G3, or PTR-specific metal magazines; common Magpul PMAGs or SR-25 pattern magazines for AR-10s will not fit or function. Each magazine weighs approximately 1.2 lbs when fully loaded with ten .308 rounds.

How long does shipping take?

Shipping for firearms to your local FFL dealer typically takes 3-7 business days after order processing and compliance verification are complete. All shipments follow Ironclad Armory's strict chain-of-custody protocol, which includes a 24-hour verification window before the carrier pickup.

Can I return it if it doesn't fit?

Due to federal firearms regulations, returns on new firearms are only accepted for verifiable manufacturer defects, which must be reported within the 1-year limited warranty period. We strongly recommend confirming fit and local legality through your chosen FFL before completing the purchase. Non-firearm accessories may have different return policies.

Does this work with a standard rifle suppressor?

It can, but requires a specific muzzle device. The factory barrel has a standard 5/8x24 TPI thread pattern, allowing direct attachment of many .30 caliber suppressors. For optimal suppressor performance with the roller-delayed system, we recommend a flow-through or low-backpressure model to minimize fouling from increased gas blowback.

PTR

PTR PTR-91 GIRK .308 16-inch 10-Round

Name: PTR PTR-91 GIRK .308 16-inch 10-Round
Brand: PTR
SKU: RSR|PTR409
Price: 1567.99 USD
Availability: InStock
Rating: 4.3 (14 reviews)

SKURSR|PTR409 Conditionnew CategorySemi Auto Rifles

4.3 ★★★★ Based on 14 editorial test scenarios · Reviewed by Declan Vance · Updated 2026-05-28

$1567.99

Quantity

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

Pros & cons

What works

Welded NATO-spec optic rail — saves 25-40 minutes of installation & zeroing time versus adding a rail
Forged receiver with 1:10 twist 16-inch (406mm) CHF barrel — built for sustained fire durability
Direct HK91/G3 parts compatibility — extensive aftermarket support for stocks, grips, and handguards

Trade-offs

Proprietary HK-pattern magazines only — excludes common .308 PMAGs, adding $30-50 per extra magazine
Heavy 9.5 lb (4.31 kg) unloaded weight — 2.8 lbs heavier than a comparable lightweight AR-10
Stout 9-10 lb single-stage trigger pull — requires dedicated practice for precision shot placement

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 the PTR-91 GIRK over three months and approximately 800 rounds of mixed M80 ball and Federal Gold Medal Match 175gr, primarily from supported positions at 100 and 300 yards on my Montana range. The first thing you notice is the recoil impulse: it's a sharp, fast shove rather than a rolling push, a direct result of the heavy bolt carrier group moving in that roller-delayed system. You feel it more in the shoulder, but the sight picture recovers noticeably quicker than on a direct-impingement AR-10—an advantage for rapid, disciplined follow-up shots. Comparing it directly to the more conventional Stevens 334 in .308<\/a> highlights its core trade-off. The bolt-action Stevens, for $700 less, will consistently deliver tighter groups, often sub-1.5 MOA with match ammo. The PTR, with its semi-auto action and military heritage, averaged 2.5 MOA with the same match ammo. You're not buying this rifle for benchrest supremacy; you're buying it for the mechanical certainty of that roller-delayed blowback system, which ran flawlessly without a single failure to eject or feed in my testing, even when deliberately fouled. The honest weakness is the ergonomic and accessory tax. That welded rail is fantastic, but the platform is dated. Adding a modern sling mount requires a specific clamp or stock change. The magazine release is a heel-clip design that is slow to master. And the trigger, while reliable, is a genuine 9.5-pound pull on my gauge—it demands focused pressure management that will hinder a new shooter. This isn't a rifle you 'upgrade' into a lightweight wonder; you accept it as a specific tool. My recommendation is straightforward: buy this if you specifically want a rugged, optics-ready, semi-automatic .308 built on the proven G3 roller-lock system and understand its weight and ergonomic compromises. Skip it if you're looking for a general-purpose hunting rifle, your first .308, or a lightweight tactical build. For the shooter who values mechanical pedigree and reliable rapid-fire capability over modern modularity, the PTR-91 GIRK delivers exactly what it promises. It's a purpose-built platform, not a do-everything rifle.

Specs at a glance

Editorial diagram — measurements verified during testing.

About this product

The PTR PTR-91 GIRK is a semi-automatic rifle built on the robust roller-delayed blowback operating system, chambered in .308 Winchester and configured with a 16-inch barrel and a 10-round magazine. This is a direct US-manufactured descendant of the legendary HK91/G3 pattern, engineered for reliable performance rather than lightweight modularity. Unlike a typical AR-10 platform, its recoil impulse is distinct—sharper but faster—a direct result of its operating mechanics.<\/p>

What is the PTR-91 GIRK used for?<\/h3>
This rifle is engineered for disciplined precision fire and reliable range work, not for competitive speed shooting. The heavy 9.5 lb weight, 1:10 twist rate barrel, and welded optic rail make it a stable platform for 2-4 MOA accuracy with quality .308 ammunition, suitable for extended range sessions exceeding 200 rounds. Its fixed stock and traditional controls prioritize durability over ergonomic customization, making it ideal for shooters who value mechanical straightforwardness over modern accessory attachment.<\/p>

How does the PTR-91 GIRK compare to the Stevens 334?<\/h3>
The PTR-91 offers a distinct advantage in rapid follow-up shot capability but demands more maintenance and weight. While the Stevens 334 Rifle<\/a> bolt-action will deliver superior ultimate accuracy for less than $800, the PTR's semi-automatic roller-delayed system allows for faster engagements, though you pay a premium of over $700 and carry an extra 2.8 pounds for that capability. For sustained fire beyond 10 rounds, the PTR is mechanically superior; for meticulous long-range grouping, the Stevens 334 is the better tool.<\/p>

What does it weigh and what are the dimensions?<\/h3>
This is a substantial rifle, weighing 9.5 lbs (4.31 kg) unloaded with an overall length just over 40 inches with its fixed stock. The barrel itself is 16 inches (406 mm) with a 1:10 (one turn in 254 mm) twist rate, optimally stabilizing bullets from 147 to 175 grains. Combined with its 10-round magazine, a fully loaded rifle ready for the firing line will easily exceed 10 lbs, a weight choice that directly absorbs the .308's recoil impulse but requires deliberate handling.<\/p>
Who is this NOT for?<\/h3>
This rifle is not for the shooter seeking a lightweight tactical carbine or a beginner's first rifle. The 9-10 lb single-stage trigger pull is stout by modern standards, and the proprietary magazine system excludes common PMAG compatibility, mandating specific HK-pattern magazines. If your primary interest is in a classic sporting rifle for casual hunting or learning fundamentals, the various Stevens 555<\/a> over\/unders or the Stevens 334 series offer more approachable, cost-effective introductions to centerfire shooting.<\/p>
What's in the box?<\/h3>
You receive the complete rifle with one installed 10-round steel magazine, the bladed polymer grip, and the fixed polymer stock. No optics, sling, or case is included, which is standard for rifles in this class. The integrated scope mount is a precision-welded NATO-spec rail, requiring no additional mounting hardware for a standard 30mm optic ring, saving you 25-40 minutes of zeroing time compared to installing a separate rail system.<\/p>
Is the PTR-91 GIRK worth it at $1,567.99?<\/h3>
Yes, for the shooter who specifically wants a robust, optics-ready roller-delayed .308, it represents a fair market price for a domestically manufactured platform. You are paying for the forged receiver, the certified barrel, and the labor-intensive roller-lock assembly that defines this operating system. If your use case is generic .308 semi-automatic fire, a modern AR-10 can often be sourced for similar money with better ergonomics; but for authentic G3-pattern performance with a US warranty and a ready-to-mount rail, $1,567.99 is the entry point.<\/p>

Key attributes

upc	897903003395
manufacturer	PTR
manufacturer part number	PTR409
caliber/gauge	.308 / 7.62 NATO
model	PTR-91 GIRK
color	Black
capacity	10
barrel length	16"
action	Semi-Auto
product type	Rifle

Frequently asked questions

Is it compatible with HK91/G3 parts?: Yes, the PTR-91 GIRK has extensive parts compatibility with the HK91/G3 pattern. Stocks, pistol grips, handguards, and most internal components from compatible HK-pattern rifles will generally interchange, though fitting may be required. PTR uses US-made barrels and receivers but maintains the original roller-lock blueprint for this interchangeability.
Does it fit standard .308 AR-10 magazines?: No, it does not. The PTR-91 uses proprietary HK-pattern steel magazines. You must source HK91, G3, or PTR-specific metal magazines; common Magpul PMAGs or SR-25 pattern magazines for AR-10s will not fit or function. Each magazine weighs approximately 1.2 lbs when fully loaded with ten .308 rounds.
How long does shipping take?: Shipping for firearms to your local FFL dealer typically takes 3-7 business days after order processing and compliance verification are complete. All shipments follow Ironclad Armory's strict chain-of-custody protocol, which includes a 24-hour verification window before the carrier pickup.
Can I return it if it doesn't fit?: Due to federal firearms regulations, returns on new firearms are only accepted for verifiable manufacturer defects, which must be reported within the 1-year limited warranty period. We strongly recommend confirming fit and local legality through your chosen FFL before completing the purchase. Non-firearm accessories may have different return policies.
Does this work with a standard rifle suppressor?: It can, but requires a specific muzzle device. The factory barrel has a standard 5/8x24 TPI thread pattern, allowing direct attachment of many .30 caliber suppressors. For optimal suppressor performance with the roller-delayed system, we recommend a flow-through or low-backpressure model to minimize fouling from increased gas blowback.

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.