I can recall thinking to myself about 10 years ago: I like this AR-15 [I was shooting at the time], but it would be interesting to see what it would take to make a bolt-action AR-15 and AR-10 platform. I didn’t linger too long on the subject, and years later I recall seeing something that looked totally different than anything I’d seen before, but brought me back to my previous thoughts about a bolt-action AR platform. It was the Uintah Precision UPR-15. Then I saw the UPR-10 on West Desert Shooter, a YouTube Channel. Right then I knew I had to try out this technology for myself!
Uintah Precision makes two styles of uppers: The UPR-10 bolt action upper for the AR-10, and the UPR-15 bolt-action upper for the AR-15. I’ll be showing both platforms here on Ultimate Reloader, and in this post I’ll kick things off with an overview of the UPR-10 chambered in 6.5 Creedmoor!
Uintah Precision UPR-10 Info
The UPR-10 is a bolt action upper receiver that only requires an AR-10 style lower (DPMS LR-308 pattern), magazines, and an optic. Everything else is included with the UPR-10 that you’ll need to build a complete rifle.
Here are the chamberings offered in the UPR-10 lineup:
- .308, 24” barrel, 1:10 Twist
- 6.5 Creedmoor, 26” barrel, 1:8 Twist (featured in this article)
- .243 Winchester, 26” barrel, 1:8 Twist
From the UPR-10 product page:
Introducing the UPR-10 – – A bolt action AR-10 upper receiver assembly for DPMS pattern AR-10 rifles. This barreled upper changes your AR-10 into a fully compliant, long-range precision bolt action rifle. With 3 barrel varieties available, you can custom pick the caliber and barrel length of your AR-10 rifle
PRECISION MADE IN THE USA
Every proprietary component of the UPR-10 upper assembly is made and assembled in The United States. This complete barreled upper assembly is ready to fire once bolted onto your AR-10 rifle. Major included parts are the hand-guard, bolt, firing pin, barrel, and handguard. The handguard is a 15” M-lok, which can be easily replaced with any free float AR-10 handguard
Want a more customized option for your AR-10? We are happy to offer special order, customized AR-10 bolt action uppers. For special order requests, call 435-738-2422
When you open the box, you’ll see the following for an UPR-10 or UPR-15 package (only the size is different):
- Upper assembly
- Instructions and literature
Putting things together couldn’t be easier (as shown in the video). Here’s what I did:
- Install M-LOK swivel stud adapter for harris-style bipod
- Install bolt in upper
- Remove conventional 308 AR-10 upper from lower
- Remove buffer and buffer spring from lower (optional, but the UPR-10 works better without these components)
- Install UPR-10 on lower
- Install scope
That’s it! But there’s one more important thing to mention: triggers, not all AR-15/AR-10 triggers are compatible.
Here’s how I configured my UPR-10: (click/tap to enlarge)
Some features and specs for this rifle:
- DPMS LR-308b lower
- Elftmann Tactical AR Match trigger (optimized for ~1.9lb pull by Elftmann)
- Magpul MOE Rifle (fixed) buttstock
- Factory magazines
- Harris S-BRM tilting 6-9″ notched leg bipod
- Bushnell Elite Tactical 4.5-30 SFP scope
A Note About Triggers
Because of the unique design of the UPR-10 and UPR-15, not all triggers are compatible. This has to do with how the bolt and the trigger interface. The good news is, there’s a lot of great triggers that will work.
A note from Uintah Precision:
UPR Compatible triggers
We are continually working to keep this list as up to date as possible. At this point in time, if it is not a
standard AR trigger or one listed below, DO NOT USE IT. There is a possibility that if the trigger is pulled,
with the bolt open, the hammer may fall before the bolt is closed completely and the lugs fully engaged.
This may cause serious damage to the rifle and/or injure the shooter. Due to the many trigger variations
available, it is impossible to guarantee they will all work safely with our upper. Again, we advise that if it
is not listed here, DO NOT USE IT.
“Standard Mil-Spec” trigger groups
Black Rain Ordinance
TriggerTech AR Diamond
TriggerTech Primary (some modification required)
Hiperfire EDT SS / EDT HG/ GENESIS
DO NOT USE THE FOLLOWING TRIGGERS
Cedar Enterprise Inc.
Wisconsin Trigger Company
I’ve used the following triggers with success with the UPR-10 and UPR-15 uppers:
More information is available on the Uintah Precision website.
Performance and Results
One of the first tests I did with the UPR-10 was to shoot some 5-shot groups with some 6.5 Creedmoor hunting ammunition that has performed well in multiple rifles. During that session, I shot the following 5-shot group at 100 yards:
WOW, I thought- that’s really good!
During an unrelated load work-up for Hornady’s 135 grain A-Tip bullets, I shot the following 10 shot ladder with the UPR-10: (click/tap to enlarge)
What’s interesting about these numbers is that the UPR-10 produced a max velocity that was nearly 100 FPS over the Hornady data. That’s a benefit of the 26″ barrel that’s included with the UPR-10. Many 6.5 Creedmoor rifles have 24″ barrels, and those will obviously produce lower velocities if all else is the same.
Uintah Precision has a 3-shot sub-MOA guarantee for all of their uppers, and I had no problem holding sub-MOA performance for 5-shot groups (significantly harder to do compared to 3-shot groups). Here’s the setup I used to verify groups as I was shooting:
Above you can see the overlay from the ShotMarker system, an e-target with integrated chronograph, and a lifesaver for me a the range!
A Versatile Package
Above, Top: LR-308b upper (308 Winchester), Middle: AR-10 buffer and buffer spring, Bottom: UPR-10 6.5 Creedmoor complete rifle
Over the years, I’ve really enjoyed shooting my DPMS LR-308b. With the addition of the Uintah Precision UPR-10, I now have a multi-caliber rifle package that uses most of the same components (grip, trigger, buttstock, magazines, etc) but enables many different shooting scenarios. If I was in a state where AR-compliance was an issue, the UPR-10 would take on a different significance for sure! This AR-10 shooting setup is both fun and versatile. I guarantee if you show up to the shooting range with an UPR-10 or UPR-15 rifle, you’ll get a lot of looks, and most likely a lot of questions! It’s definitely something different.
And there’s more related content to come here on Ultimate Reloader including:
- More UPR-10 shooting
- UPR-15 content (6.5 Grendel!)
- UPR builds (now that will be cool)
Order yours here:
So make sure you’re subscribed! Do you have an UPR-10 or UPR-15? I’d love to hear your stories, please leave a comment!