Rainier Arms Ultramatch International Billet Rifle – Build of the Week

Disclosure: Some of the links below are affiliate links, meaning at no additional cost to you, Ammoland will earn a commission if you click through and make a purchase.

Check out Rainier Arm’s new rifle build of the week breakdown!

Rainier Arms Ultramatch International Billet Rifle
Rainier Arms Ultramatch International Billet Rifle

USA – -(AmmoLand.com)- This week’s custom rifle build is a bit different than ones we have shown off before. For some years, Rainier Arms has been involved with the international sales of firearms and accessories too numerous countries around the globe. This rifle, in particular, was assembled for an international show. Therefore the parts chosen were used to showcase some of the best products Rainier has to offer.

Rainier Arms International Build Rifle

Rainier Arms International Build Rifle 2
Rainier Arms International Build Rifle Upper Build
Rainier Arms International Build Rifle Parts List 1a
Rainier Arms International Build Rifle Parts List 1a

The rifle begins with a Rainier Arms Ultramatch Billet Upper receiver. This particular option has been a top seller on our site for a while. CNC machined from 7075-T6 aluminum and finished with a mil-spec hard coat anodize to a surface hardness of 60 Rockwell, these uppers are some of the best in the business.

Paired with the Geissele MK14 rail, arguably one of the best rails on the market, this rifle system is built like a tank. Shining through underneath the flat black exterior of the rail system is the Rainier Arms Ultramatch MOD 2 16 inch barrel. This fluted and polished piece is made from the finest blanks available and is a perfect balance between accuracy and weight. Rainier Arms guarantees their barrels and offers a 100% money back guarantee if you aren’t completely satisfied with its performance. On the end of the barrel sits the Fortis 5.56 muzzle brake which aids in maintaining control of the weapon and helps you stay on target for faster follow up shots.

The bolt carrier is from Bravo Company USA, which makes some of the finest AR parts in the industry. The charging handle is our new Rainier Arms Avalanche Mod 2 which comes with two different options for handles; either the longer ones shown, or a rounded knurled latch for extra grip. Both can be easily interchanged.

The optic is a CTS-1100 by Crimson Trace. This illuminated 3.5x battle sight for rifles and carbines features a fully illuminated BDC (Bullet Drop Compensator) reticle. With a wide field of view, this optic excels in mid to long range engagement distances, elevating your gun’s ability to engage targets in a multitude of environments. It can be installed in seconds by using an integrated M1913 picatinny rail mount and boasts an impressive design that will put up with years of abuse.

The final part on the upper is the bipod. Although an add a decent amount of weight to the firearm, bipods can help the shooter stretch their rifle to its full capability, especially with a more mid to long range optic attached. Fitted here is the Accu-Tac LR10 Gen 2 bipod. The LR-10 was designed, engineered, and manufactured in the USA. Made from the highest quality aircraft aluminum available and 100% billet. It’s wide stance and ratcheted leg extension gives you the adjustability needed for precision aim and repeatability. The bipod can be canted and locked in place using the throw lever and has a longer extension height with a total of 10 notches.

Rainier Arms Ultramatch International Billet Rifle Lower Build

Note: a lot of folks like this lower build by its self and have built it as we have here and just added their existing pre-built upper.

Rainier Arms Ultramatch International Billet Rifle 3
Rainier Arms Ultramatch International Billet Rifle Lower Build
Rainier Arms International Build Rifle Parts List 2
Rainier Arms International Build Rifle Parts List 2

Moving down the rifle, the lower is a Rainier Arms Overthrow receiver cerakoted by Blowndeadline. Machined from 7075-T6 aluminum and a hard coat anodize Black finish, this lower is top notch. Plus, for those of you who are fans of the movie 300, the beautiful paint job of the helmet will give this rifle a special sort of flare that sets it apart from other builds.

Internally the rifle sports a Elftmann match straight trigger which can be adjusted from 4lbs to 2 1/2lbs without removing it from the lower. This is a perfect addition for mid to long range when consistent trigger pulls are key to accuracy. The KNS anti-rotational pins keep the trigger in place, using anti-creep retainers, that negate the issue of movement in the trigger housing over extended use.

Externally, the lower is finished out with a Magpul UBR Gen 2 collapsible stock, Rainier Arms 45 Degree Ambidextrous Safety Selector and the V-Seven ultra-light S7 bolt catch.

All of these parts combined make this a very durable, high-quality rifle that will also set itself apart from the pack. There are so many combinations of rifles and parts out in the world; it can sometimes be hard to create something that is truly unique to you.

As we’ve said many times before, these ARs are just a glimpse into what you can build. Whether or not you want to run something like this or do something entirely different, everyone has a certain way they like doing things.

If you’re looking to start your next build right now, be sure to check out our site. If you want to find the parts used on this weeks rifle, check them out below.

Look out next week for our next build breakdown!


About Rainier ArmsRainier Arms logo

Rainier Arms was started by enthusiasts for enthusiasts. We specialize in high-end AR15s/M16s, parts & accessories. “If we won’t use it, we won’t sell it.” Founded in 2005, Rainierarms.com already has more than 2547 unique products, and growing. Our technical advisory team consists of enthusiasts, law enforcement, & military personnel that continue to make our offerings unique and desirable in the market place. www.rainierarms.com.