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Rainier Arms, LLC

Rainier Arms UltraMatch Billet Upper & Ambi Lower Combo Set - MOD 3

Rainier Arms UltraMatch Billet Upper & Ambi Lower Combo Set - MOD 3
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Rainier Arms UltraMatch Billet Upper and Lower Combo Set MOD 3

Our billet sets are CNC machined from solid billet 7075-T6 aluminum which is 70% stronger than the commonly used 6061 aluminum and finished with milspec hardcoat anodize to a surface hardness of 60 Rockwell. We have designed our lowers with an ambidextrous magazine release and bolt release with extended latch for smoother deployment. The precision machining on our billets are well known in the industry and we are excited to introduce our combo sets for your next rifle build.


  • Ambidextrous Extended Bolt Release
  • Ambidextrous Magazine Release
  • A4 Feed Ramps
  • 7075 Billet Aluminum
  • Flared Magwell
  • Integrated Trigger Guard
  • QD Socket machined in
  • Tensioning Screw for proper Upper/Lower Fit

FFL Required Before Shipping.

Please have your dealer email their license to or they can also fax it in. Please give us a few days to process the information.

Additional Info

Additional Info

Manufacturer Rainier Arms, LLC
Finish No
Barrel Length No
Caliber No
Configuration No
Option No
Gas Length No
Height No
Rail Length No
Mount No
Profile No
Reticle No
Co Witness No
Size No


Customer Reviews (10)

No commentReview by Nicholas
- (Posted on 11/9/2016)
No commentReview by Justin
- (Posted on 10/15/2016)
No commentReview by Michael
- (Posted on 10/13/2016)
BEST IN SHOW!Review by Devon
Truly a matched set. Beautiful, sturdy, and controls were very well thought out. Will be using this set for every future build. It is not pictured with a dust cover or forward assist, but they were included and installed. Also Rainier Arms was very prompt with the shipping to my FFL. A+ in my book. (Posted on 7/16/2016)
High Quality productReview by Y,S.
This is a very good high quality produced lower upper combo. The fit between the two parts is excellent, no unnecessary play. Also the upper that is supposedly stripper comes with the forward assist and ejection cover. Thanks for great service too. (Posted on 7/15/2016)
High quality fair priceReview by Stewart
I used this reciever set in a 3-gun build, i must say I am impressed at the fitment and weight. Full ambi controls that work well, plus a so far wear resistant finish has left me a happy customer. The set comes with the forward assist assembly and dust covered already installed, the picture doesn't show that. Very nice, very lightweight, very happy. (Posted on 4/27/2016)
Nice ambidextrous comboReview by Charlie
Sorry I didn't buy direct, I bought from local gun shop that had it in stock. I had to have it when I got my hands on it . I use it for practical rifle set up 16" barrel 15" rail, ubr stock, vortex 2.5x10 scope, and 45 degree off set irons. Looks great and functional ! (Posted on 2/19/2016)
Most amazing brilliant innovation Review by Jon Sadler
I have owned and ran several different uppers and lowers in my years of owning AR15 profiles and hands down does rainier arms ultramatch upper and lower set bring the best of the best in quality, innovation and aesthetics. I will be passing their products on to others to desire as I do. I will never buy any other upper and lower but theirs.
Thank you Rainier Arms! (Posted on 1/21/2016)
Excellent workmanship and some extra surprises!Review by TT
Super fast shipping to my FFL. Just picked it up. Much to my surprise, the upper came with installed forward assist and ejection-port cover. Nice touch. Can't wait to get this build underway. Awaiting my Ranier 18" Ultramatch SPR barrel that I ordered yesterday. (Posted on 1/7/2016)
Excellent Review by JJLee
This ultra light billet upper and ambi lower combo is like no other. The quality, finish, and figment is perfected. Definitely a must have for a light weight ambi billet AR build. (Posted on 9/29/2015)

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