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Close-up view of the bolt locking rollers for the G3's roller-delayed blowback mechanism

G3 Bolt Locking Rollers 2-pack


(Out of stock)

  • Close-up view of the bolt locking rollers for the G3's roller-delayed blowback mechanism Close-up view of the bolt locking rollers for the G3's roller-delayed blowback mechanism

Quick Overview

The G3, as you may know, is a semi-automatic rifle that utilizes a roller-delayed blowback system of operation. In general, blowback refers to any action that operates on the energy created by the movement of the cartridge as it is forced back into the bolt head by the expansion of gases that result from combustion in the chamber. In any firearm that employs roller-delayed blowback, the locking rollers are an integral component of the bolt. Locking rollers are small, cylindrical parts that serve to both hold the bolt in battery and release the bolt from battery.

The G3 bolt locking rollers are original parts manufactured by Heckler & Koch. They are housed in the locking roller retainer plate and located in the breech. As in any roller-delayed blowback operated firearm, the barrel is fixed. When the bolt head is forced back, the bolt locking rollers move inward against the bolt carrier extension, forcing it back at a high velocity and delaying movement of the bolt head. If either of the rollers fails, it will need to be replaced immediately.

For a better grasp on the rollers and where they are located, check out this overhead schematic of the G3’s roller-delayed blowback device. For $3.95, you will receive a replacement pair (two) of G3 bolt locking rollers.

Availability: Out of Stock



The G3 bolt locking rollers are a component of the roller-delayed blowback device and located in the breech. They are original factory parts made in Germany by HK.

Spare parts are an important consideration when it comes to firearms. Like any machine, firearms rely on a series of parts to function properly, including any component of the bolt. If a part breaks or fails, a repair or replacement is necessary.

It is also important to consider availability. At this time, has a wealth of authentic, original factory parts from HK for the G3/HK91/PTR91. Not only are they readily available, but also they are cheap. Now is the time to take advantage.

Additional Information

Manufacturer No
Free Shipping No
Brand H&K
Gun Model HK 91, HK G3, PTR91
Construction Steel
Condition Excellent
Manufacture Status Original Item
Returns Accepted Yes - Must Not Be Modified Or Visibly Used
100 5 100 0
  1. Great spare parts to keep around review by Tim on 4/23/2015

    These rollers came exactly as pictured, very happy with them. These are some great spare parts to keep around.

  2. you'll need them review by Michael on 1/10/2014

    These do eventually wear down and thereby lose the ability to lock the bolt face snugly to the chamber. At some point it could cause a major malfunction. Who wants a loose head space?

  3. Look New.. review by Jeff on 2/19/2013

    These rollers look great and work well for my spare parts kit.

  4. hk rollers great buy review by joshua on 2/3/2013

    bought 2 sets never know when you will need spare parts

  5. Sweet deal on a hard to find item review by Brian on 1/17/2013

    Rollers are one of those items that take a lot of abuse, and are getting hard to come by. So if you shoot on a regular basis as I do, spare parts are a must. I measured these and they are exactly 8.00mm. Sweet deal for keeping that important bolt gap spacing right. Thanks Keepshooting PS lets see some roll pins for the rollers soon guys keep up the good work.

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