Rainier Arms RUC PRO MK1 5.56 NATO Partial Upper Receiver
AR-15 Partial Upper Receiver
In stock
Rainier Arms RUC PRO MK1 5.56 NATO Partial Upper Receiver
$550.00 - $625.00
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Introducing the RUC PRO MK1 Partial Upper. Bringing the highest quality parts to the market, while offering the best value as well. This partial upper utilizes a Rainier Arms Low Pro nonadjustable gas block on our new and improved Rainier Arms Select barrel. Pairing up with new PRO series MK1 handguard to provide shooters with a rock solid handguard that can take any abuse. Throw in your favorite charging handle and bolt carrier group and you are good to go!
10.5" Upper:
- Rainier Arms Select 5.56 NATO Barrel - 10.5"
- Rainier Arms Forged Upper Receiver
- Rainier Industries PRO Series MK1 Handguard - 9.55"
- Rainier Arms Low Pro Gas Block - .750" (Non-adjustable) (Gasblock pinned)
- Rainier Industries .223/5.56 Flash Hider - 1/2x28
- Carbine Gas Length
- Weight: 2 lbs 14 oz
11.5" Upper:
- Rainier Arms Select 5.56 NATO Barrel - 12.5"
- Rainier Arms Forged Upper Receiver
- Rainier Industries PRO Series MK1 Handguard - 11.7"
- Rainier Arms Low Pro Gas Block - .750" (Non-adjustable) (Gasblock pinned)
- Rainier Industries .223/5.56 Flash Hider - 1/2x28
- Weight: 3 lbs 2.6 oz
12.5" Upper:
- Rainier Arms Select 5.56 NATO Barrel - 12.5"
- Rainier Arms Forged Upper Receiver
- Rainier Industries PRO Series MK1 Handguard - 11.7"
- Rainier Arms Low Pro Gas Block - .750" (Non-adjustable) (Gasblock pinned)
- Rainier Industries .223/5.56 Flash Hider - 1/2x28
- Weight: 3 lbs 2.6 oz
14.5" Upper:
- Rainier Arms Select 5.56 NATO Barrel - 14.5"
- Rainier Arms Forged Upper Receiver
- Rainier Industries PRO Series MK1 Handguard - 13.7"
- Rainier Arms Low Pro Gas Block - .750" (Non-adjustable) (Gasblock pinned)
- Rainier Industries .223/5.56 Flash Hider - 1/2x28
- Weight: 3 lbs 8.4 oz
16" Upper:
- Rainier Arms Select 5.56 NATO Barrel - 16"
- Rainier Arms Forged Upper Receiver
- Rainier Industries PRO Series MK1 Handguard - 15"
- Rainier Arms Low Pro Gas Block - .750" (Non-adjustable) (Gasblock pinned)
- Rainier Industries .223/5.56 Flash Hider - 1/2x28
- Weight: 3 lbs 12.6 oz
Please NOTE: BCG and Charging Handle NOT Included.
| SKU | RA-RUC-PRO-MK1-XX-PU-BLK |
|---|---|
| Product Type | AR-15 Partial Upper Receiver |
| Manufacturer | Rainier Arms, LLC |
| Gas Block Diameter | .750" |
| Thread Pitch | 1/2x28 (.22 cal) |
| Color | Black |
| Mount | M-LOK |
| Platform | AR-15 |
| Caliber | 5.56 NATO |
| Threaded | Yes |
