Matador Arms has released a new AR lower receiver compatible 9mm monolithic upper receiver assembly called Montgo-9. One of the key features of Montgo-9 is that the recoil spring mechanism is contained inside the receiver itself and it does not require an AR buffer tube, buffer or recoil spring to operate. This feature will allow you to have a folding stock that does not render the gun inoperable when folded or don’t have a stock at all. Let’s take a closer look.

Matador Arms @ TFB:

• Matador Arms AR9 80% 9mm Lower Receiver
• Matador Arms REGULATOR Adjustable Port Muzzle Brake
• Matador Arms Mag-X (P320) AR-15 Magazine Adapter
• Matador Arms SIDEWINDER Folding Buffer Tube Adapter
• Matador Arms FLARESTACK Combination Muzzle Device

Matador Arms Montgo-9 is a simple/direct blowback operated system. The actual receiver is made of hard coat anodized billet aluminum. The bolt and trunnion are machined of 4140 steel. This upper assembly is compatible with any 9mm AR lower receiver as well as AR-15 lower receivers retrofitted with 9mm magazine adapters. The Montgo-9 upper will be initially available with a 5.5″ barrel (K version) which means it can be used to build a 9mm pistol or SBR. Montgo-9 uppers with longer barrels will be available in the future.

Matador Arms Montgo-9 upper receiver assembly also features a 1/2×28″ threaded muzzle, non-reciprocating reversible charging handle, a full-length integral top Picatinny rail and a 3.5” Picatinny rail section at the bottom of the handguard. The slots on the sides of the handguard are not M-LOK slots. The field stripping of this upper assembly does not require a use of tools. The overall length of the Montgo-9 upper receiver is 12-1/8″ and it weighs in at 3.5 lbs.

The MSRP of Matador Arms Montgo-9 upper receiver assembly is $549.99. The estimated start of shipping is in Q4, 2021. This product is made in the USA.

Pictures by Matador Arms, matadorarms.com