+1-800-504-5897 Help Center Check Order Status
About Us Policies Reviews How To
Free Shipping & Free Returns*

FREE SHIPPING on Over 250,000 Products

Enjoy free shipping during the holidays! Shop now and get Free Value Shipping on most orders over $49 to the contiguous 48 states, DC and to all U.S. Military APO/FPO/DPO addresses.

Enjoy Our Extended FREE RETURNS

We want to ensure that making a return is as easy as possible! With our Hassle-Free, Extended Holiday Returns, eligible orders placed from November 12, 2025 on will benefit from an extended return deadline (January 13, 2026 or 30 days after receipt of your order - whichever is later). We'll even cover the cost of return shipping. Learn more about our Return Policy.

  • Entire Store
  • ...
  • Apparel & Footwear
  • Astronomy
  • Everything Else
  • Eyewear
  • Hunting Gear
  • Lab Equipment
  • Military Gear
  • Outdoor Gear
  • Photography Equipment
  • Police, EMS & Fire
  • Shooting
  • Sport Optics
  • Sports & Hobbies
TIP
Shopping Cart

Rock River Arms Mountain Pistol 10.5in Upper MT0364 Caliber: 5.56x45mm NATO, Overall Length: 20 in, 15% Off w/ Free S&H

Rock River Arms Mountain Pistol 10.5in Upper, Black, MT0364
Rock River Arms Mountain Pistol 10.5in Upper, Black, MT0364
1 of 1 images
Rock River Arms Mountain Pistol 10.5in Upper, Black, MT0364

Tap Tap to Zoom

Government Export Restriction Government Export Restriction
Government Restriction Government Restriction
Questions & Answers
Caliber: 5.56x45mm NATO Overall Length: 20 inBarrel Length: 10.5 inBarrel Profile: Standard Gas System Length: Pistol Length Barrel Twist Rate: 1-7 Threads per Inch: 1/2x28 Muzzle Device: A2 Flash Hider Color: Black Gun Model: Universal Handguard Length: 9.5 inWeight: 4 lb

Code: 1WN-UFH-RRA0903-MT0364

MPN: MT0364

UPC: 842834101238

List: $530.00Save 15%
$449.99

ATTENTION! We currently do not ship this product to AK, CA, HI, IL, NY, WA, P.O. Boxes, and U.S. Territories. Please see our policies for more information.

Product Info for Rock River Arms Mountain Pistol 10.5in Upper

Intended to be regarded as a great product for pretty much any individual, we are certain you'll love the Rock River Arms Mountain Pistol 10.5in Upper.image

Formulated by using some of the very most strong and dependable components in existence, these AR15 Upper Receivers from Rock River Arms offers you something that gives you many years of consistency.

Rock River Arms has been making top quality merchandise for a number of years, and the Rock River Arms Mountain Pistol 10.5in Upper is their particular approach to revealing how much they are concerned.

Right here at OpticsPlanet, we make it our responsibility to receive the perfect solution for all of your preferences, and showcasing the Rock River Arms Mountain Pistol 10.5in Upper is one thing that we're happy to offer.

WARNING: California`s Proposition 65

Specifications for Rock River Arms Mountain Pistol 10.5in Upper:

Manufacturer: Rock River Arms
Caliber: 5.56x45mm NATO
Overall Length: 20 in
Barrel Length: 10.5 in
Barrel Profile: Standard
Gas System Length: Pistol Length
Barrel Twist Rate: 1-7
Threads per Inch: 1/2x28
Muzzle Device: A2 Flash Hider
Color: Black
Gun Model: Universal
Fabric/Material: Stainless Steel
Handguard Length: 9.5 in
Gun Rail: Full Top Rail
Weight: 4 lb
Magazine Included: No

Package Contents:

  • Rock River Arms Mountain Pistol 10.5in Upper
  • Bolt Carrier Group
  • Charging Handle Assembly

What firearm models does the manufacturer say Rock River Arms Mountain Pistol 10.5in Upper is compatible with?

The manufacturer says that Rock River Arms Mountain Pistol 10.5in Upper is compatible with Universal

Rock River Arms Mountain Pistol 10.5in Upper Orderable Models

List of Orderable Models

  • Rock River Arms Mountain Pistol 10.5in Upper, Black, MT0364 , MPN: MT0364 , UPC: 842834101238 , Code: 1WN-UFH-RRA0903-MT0364
Compare (0)
1 item has been added
Add at least two items to compare