Tiger Rock 9mm AR-9 Pistol Length Complete Upper with Super Slim M-LOK Handguard - 4.5"

Manufactured by Tiger Rock
SKU: UB9-P4.5-FSSM04
MPN: UB9-P4.5-FSSM04
Manufactured by Tiger Rock
1 Review

Out of Stock

NOTE: Limit 1 per household. Quantities exceeding 1 will not allow checkout.



Note: This upper receiver features a barrel shorter than 16" and is subject to all NFA rules and regulations as well as your local laws. Must be attached to a pistol lower receiver or registered SBR lower.

Building a 9mm AR pistol has never been easier with the Tiger Rock AR-9 Complete Upper Receiver Group. Compatible with Mil-Spec AR-15 lowers with 9mm mag conversions or even dedicated 9mm lowers, so you can set up your pistol however you like. It features a short 4.5” barrel with an A2 style flash hider and a super slim M-LOK handguard for an extremely light and compact setup. The barrel has a standard 1:10 twist rate and is black Nitride finished for long term wear resistance. The upper receiver is fully assembled with dust cover, forward assist, and charging handle and the flat top picatinny rail is great for red dot sights. Also included is a Nitride finished 9mm Bolt to help reliably cycle the blowback system. Get started building your 9mm AR Pistol with the Tiger Rock Complete 9mm Upper Receiver Assembly today.

  • AR 9mm Bolt with Nitride finish
  • 4.5” barrel with Nitride finish
  • 1:10 twist rate
  • A2 style flash hider with 1/2x36 thread pitch
  • Super Slim M-LOK free float handguard
  • Flat top upper receiver hard coat anodized
  • Mil-Spec upper parts kit

Founded in 2011, Tiger Rock Inc is a smart choice for a wide variety of superior quality sporting/firearms accessories.
See More


AssemblyComplete Assemblies
Barrel ContourMedium
Barrel Length4.5
BrandTiger Rock
Caliber Gauge9mm Luger
Gas System LengthBlowback
Gas System TypeBlowback
Muzzle DeviceA2 Flash Hider
Twist Rate1:10

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see www.p65warnings.ca.gov

Ratings & Reviews

1 review

  • 5 stars
  • 0 reviews
  • 3 stars
  • 0 reviews
  • 2 stars
  • 0 reviews
  • 1 star
  • 0 reviews

It works

by -

I picked this up for a great price on the Independence Day sale, but also because it wasn't listed specifically for Glock mags. Dropped onto an Aero pistol lower with a KAK SMG mag well adapter and, after getting the mag well set up correctly, it just works. Added a 5.5oz buffer and heavy carbine spring to tame the recoil. Knocked off one star for the less common flash hider thread but the standard A2 looks fine.