Specifications: – Roller delayed blowback action – Tri Lug Muzzle attachment and 1/2×28 Threads – Diopter sights – Two 30 RD magazines Included – Sling Included – Tri Lug flash hider included – Cleaning kit included – HK® Furniture and accessory compatible – Black laquer paint over phosphate – Compatible with HK® compatible components as well as Mac branded components – Detailed specifications: – Finish – Laquer Paint overtop of parkerization – Plastic Specifications – PA6 gF30 – Trigger Pull – 4.25 Lbs average – Muzzle Threads – 1/2×28 – Tri-Lug Adapter – Barrel – 8.9 or 5.8 Button rifled 9mm barrel – Sights – fully adjustable rear with hooded front post and diopter rear on full size Mac 5. K models feature Castle style rear notch sights – Chamber – 9x19mm fully fluted chamber – Sling – Web two point sling – Flash Hider – Machined tri lug flash hider – Magazines – Welded steel mags with chrome follower with 30rd capacity – The firearm includes: – 1 Mac 5K Firearm – 9mm – 2 30 Rd magazines – 1 Cleaning Kit – 1 Sling – 1 Tri-Lug Flash Hider