F5-ACR Gen 3 Stock + F5 Mfg 50-Round Drum Bundle: G3 / HK91 / HK51 (Turn-Key, Includes Recoil Rod & Spring)
The F5-ACR Gen 3 Stock for G3/HK91/HK51 is the most ergonomic, feature-rich, and rugged side-folding stock available for the platform. This bundle pairs it with an F5 Mfg 50-round drum magazine, so your G3-pattern rifle gets a complete upgrade in one order: a fully adjustable folding stock, a recoil rod and spring assembly, and high-capacity drum feeding.
The stock is a turn-key kit. Unlike other G3 stock adapters that leave you sourcing a separate recoil rod and spring, this kit includes the recoil assembly, so it drops onto your rifle ready to run, with no gunsmith, no scavenged surplus parts, and no compatibility guesswork.
Why This Bundle Is Different
- Most ergonomic, feature-rich side-folder for this platform. It has a fully adjustable cheek riser, not just a fixed folding hinge.
- True turn-key installation. Recoil rod and spring are included, not sold separately.
- Rugged, duty-grade construction. The stock is CNC-machined 6061 billet aluminum, and the F5 Mfg drum is [precision machined from billet aluminum and Cerakote-protected].
- Drop-in fit. The stock needs no gunsmithing or fitting.
- One order, one upgrade. Stock, chassis, recoil assembly, and 50-round drum ship together.
Features: F5-ACR Gen 3 Stock
- Fully adjustable cheek riser to dial in cheek weld for scopes, red dots, LPVOs, or night vision
- Folds without interfering with function, so you can fire while folded on supported configurations
- CNC-machined 6061 billet aluminum chassis for a rock-solid, repeatable lockup
- Reinforced polymer stock body for weight savings without sacrificing durability
- Slip-fit tolerances for minimal play under recoil
- Compact side-folding design for transport, vehicle carry, and storage
- Compatible with G3, HK91, HK51 -pattern rifles and clones
Features: F5 Mfg 50-Round Drum
- 50-round capacity, so you spend more time shooting and less time reloading
- Billet aluminum construction with Cerakote finish
- Built by F5 Mfg in the USA, like the rest of their drum lineup
- F5 recommends FMJ brass-cased ammunition for most reliable feeding
What’s in the Box
- F5-ACR Gen 3 folding stock chassis with adjustable cheek riser
- G3/HK91/HK51-pattern recoil rod
- Recoil spring
- F5 Mfg 50-round drum magazine for G3/HK91/HK51-pattern rifles
- All hardware needed for a complete, turn-key stock install
Magazine Capacity Notice
This bundle includes a 50-round magazine, which may be restricted in some areas. It is the buyer’s responsibility to check and comply with all federal, state, and local laws on magazine capacity.
Built for G3 Owners Who Want More Than an Adapter
Other options give you a folding hinge and call it done. The F5-ACR Gen 3 gives HK91/51 owners real ergonomic adjustability, rugged billet aluminum construction, and a true turn-key install. Add a 50-round F5 Mfg drum and the rifle is ready for range days and shooting events.
Order your F5-ACR Gen 3 Stock + 50-Round Drum Bundle today.
