Montgo-9 9mm Details
The Montgo-9 9mm is a complete upper receiver designed for use with AR-15 and AR-9 lower receivers.
3D gun developer YZY (xYeezySZN) developed a lower receiver that is designed to be compatible with the Montgo-9 uppers available for purchase online.
YZY’s Montgo-9 package was created by remixing designs from RKSpookware’s UBAR-9 and IvanTheTroll’s AR-15 UBAR receiver, with the addition of geometry from Not_SpookyGuns’ AR-9 Firebolt platform.
The package has been modified to improve its appearance and includes an extended mag release for easier use. It is compatible with RKSpookware’s UBAR-9 but has removed some unnecessary hardware that is typically required for firearms that use a buffer tube.
Montgo-9 9mm in the Wild
YZY's Montgo-9 3D printable lower receiver.— YZY (@YZYPrints) April 9, 2023
Now available on my Odysee. pic.twitter.com/klCwMBEAic
Montgo-9 9mm Tech Specs
The Montgo-9 is a blowback-operated weapons system that does not require a buffer (buffer tube / spring).
The Montgo-9 upper receiver is made of hard coat anodized billet aluminum, while the bolt and trunnion are machined from 4140 steel for durability. It features a threaded barrel for attaching flash hiders or suppressors.
The Montgo-9 9mm is compatible with any 9mm AR lower receiver as well as AR-15 lower receivers retrofitted with 9mm magazine adapters. This is also obviously compatible with YZY’s Montgo-9 lower receiver.
Required Parts for the Montgo-9
1 x MatadorArms Montgo-9 Upper Receiver, Gen1
2 x 98306A164 Clevis Pin, 1/4″ Diameter, 1-7/16″ Usable Length
1 x Glock Mag Catch Spring
1 x Glock Mag Release
1 x M3x30mm socket head cap screw
1 x Machined Steel Ejector for the UBAR-9 from RKSpookware
2 x M3x20mm socket head cap screws – 2x M3 hex nuts
The Montgo-9 requires basic gunsmithing tools and a 3D printing setup.
Using a dialed-in Ender 3 with widely available PLA+ filament will get the job done.
- Set of Rollpin Punches
- 3/8”, 5/32”, and 1/4 “ drill bits with electric handheld drill
- Gunsmith Hammer (brass and nylon)
- M3 hex wrench
- Lubricating Oil
- 1/4×28 thread tap with #3 (0.213″) drill bit
- Long 3/16” Hex Key/Wrench or flathead screwdriver depending on grip screw
Suggested 3D Print Montgo-9 Settings
The slicer settings for the 3D-printed Montgo-9 are similar to the majority of setups for other 3D gun builds but optimized by YZY:
Layer Height: 0.16-0.2
Wall Line Count: 8-12
Infill: 99%, absolutely no less.
Supports: Use support blockers around the bolt catch and mag release button areas, as documented in photos on page 8
- PLA+ (eSun, Polymerk or simular
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