HK91 / G3 / HK51 Receivers / Uppers
Upgrade the core of your HK G3/91 or PTR 91. Choose from genuine HK receivers, high-quality US-made options, and custom receivers for specialized builds.
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On Sale
HK Stock Pin Bushing Weldment
HKP HK Parts
Now: $3.16Was: $3.95HK Stock Push Pin Bushing Weldment All-steel stock pin bushing weldment for welding in the rear of the flat. This bushing welds into the folded flat and guides the large push pin through the receiver...HKP-17573Now: $3.16Was: $3.95 -
On Sale
HK91, G3 Receiver Flat - US Made
PTR
Now: $79.97Was: $99.95HK G3, 91, PTR & CETME Flat - PTR Made by PTR with original HK tooling using factory specifications and a properly stamped receiver. No FFL is required as this is an unfolded flat that ships directly...HKP-02320Now: $79.97Was: $99.95 -
HK Barrel Pin Retaining - 5mm - Standard Size
H&K Heckler & Koch
$9.95H&K HK Pin - Barrel - Retaining - 5mm - Standard Size Barrel Retaining Pin Each barrel pin is used for installing a new or replacement barrel. HK suggest using a new factory barrel pin when...HKP-00071$9.95 -
HK91, G3, CETME Receiver Flat with Weldment Set
PTR
$189.95HK91, G3, PTR, CETME Flat & Weldment Combo - PTR Made by PTR91 on original HK tooling using factory specifications and a properly stamped receiver ready to roll and build. No FFL transfer is...HKP-02086$189.95 -
On Sale
HK90 Series Mag Paddle Bushing with Pin for Semi Builds
DTAC Dakota Tactical
Now: $7.92Was: $9.89DTAC Mag Paddle Bushing With Pin For Semi-Builds This part is made 100% in the US from 17-4 stainless steel. Latest production with patent pending anti-binding enhancement upgrade. Accurate tolerance...HKP-02194Now: $7.92Was: $9.89 -
HK MP5, MP5K, HK33, HK53, HK93, HK91, G3 Cocking Tube Hanger Clip
H&K Heckler & Koch
$13.95Heckler and Koch Cocking Tube Hanger Clip The HK cocking tube support hanger is the part that welds onto the end of the cocking tube that allows the forearm to install with the use of a small push...HKP-00349$13.95 -
On Sale
HK MP5, MP5K, G3, HK93 Paddle Magazine Release - Extended - EMR
HKP HK Parts
Now: $35.96Was: $44.95HKP HK Parts Paddle Style Extended Magazine Release with EMR for HK MP5, HK G3, HK 33 and more A great addition to any paddle style mag release, such as those found on an HK. The extended mag release...HKP-17079Now: $35.96Was: $44.95 -
On Sale
HK91, G3 Rear Push Pin Reinforcement Weldment
PTR
Now: $23.96Was: $29.95HK91, G3, PTR, CETME Push Pin Reinforcement Weldment HK91/G3/PTR91 or CETME steel receiver flat weldment that is added to the rear of the receiver where the 2 large stock push pins install to...HKP-18224Now: $23.96Was: $29.95 -
HK Semi Shelf Weldment - Metal Grip Housing
HKP HK Parts
$14.95HKP Semi Shelf Weldment Metal Grip Housing For Semi-Auto Trigger Packs This HK German specification metal trigger frame weldment is designed for converting SEF style housings from full auto to...HKP-16657$14.95 -
On Sale
HK91, G3 Weldment Set Complete
HKP HK Parts
Now: $79.97Was: $99.95HK G3, HK91, PTR Weldment Set Complete New US manufactured billeted from solid ordnance grade bar stock. Perfect for roller lock or other custom builds. Each weldment set unit is precisely machined...HKP-17509Now: $79.97Was: $99.95 -
On Sale
HK33, HK53, HK93, HK91, G3 Rear Sight Base Weldment
HKP HK Parts
Now: $23.96Was: $29.95HKP HK Parts Rear Sight Base Weldment for HK G3, HK91, PTR & HK93, 33 & 53, FMP21 New US manufactured billeted from solid ordnance grade bar stock. Perfect for roller lock or other custom builds...HKP-17386Now: $23.96Was: $29.95 -
HK MP5, HK90 Series Magazine Catch Roll Pin - Push Button
H&K Heckler & Koch
$4.95Heckler and Koch Magazine Catch, Push Button Roll Pin New HK German-made. The mag catch roll pin is used to attach the magazine catch to the mag release button. Compatible With:HKP-01918$4.95