Following up on the sneak peek of Spuhr AB’s mystery receiver we showed last week is a bit more information on what they are referring to as the Enclosed Receiver System Project. This is strictly a prototype.
The concept was borne out after Håkan Spuhr purchased his first AR-10 in 2011. Since then he has been interested in eliminating impact shifts caused by loading stress on the Rifle via bipods and other forces. He felt the best answer was to make the receiver into a single piece.
The Receiver is a monocoque design, combining what are traditionally, upper and lowers. The Receiver Extensive swivels to the right, out of the way in order to remove the bolt. The bolt and barrel are of standard design. You may also notice that the Pistol Grip Module swings forward for maintenance. We were not allowed to photograph the interior.
As you can see, the Receiver is also reinforced at the front with a buttress-like affair. The controls are ambidextrous.
Of particular note is the Magazine Release on the Left side. It fits into an indent so that it won’t accidentally be pushed while patrolling.
There are also Spuhr mounts on either side of the Receiver.
This is so new that it doesn’t have an actual name yet. More details to follow.
Beautiful execution as always from Spuhr, but looks complicated to manufacture. And thus even more expensive than usual for Spuhr.
Agreed… I think weight will be an issue.
Can we call that “buttress-like affair” a gusset? Spuhr is not only pushing the edges of the design envelope with this design, but breaking them down. This guy has been doing it right for along time without the BS. Real engineering and manufacturing… without DNA sprinkling and ultra hip retro add campaigns. Do you get it?
Any word on their thread-in breechface bolt that was on Insta? (Assuming that was part of this build per the lug pattern).
Also to confirm this is a large-frame 308 gun?
I imagine an upper made of a solid piece of 7075T6 from gasblock to receiver extension like colt or LMT would do far more to stop any loading shift than this. In that regard I think colt Canada has a great receiver set that I wish would be made by colt USA.
While a great engineering exercise this seems like it abandons a traditional receiver for something that is more expensive and only serves to make the rifle harder to clean.
Plus I don’t think the right side bolt release is big enough. Does look cool though.
Exactly what I was thinking. I have the Colt Canada monolithic upper and I cannot imagine a stiffer platform for an upper.
Snipers Hide did a video on the Seekins SP10 and how they stiffened the upper to achieve remarkable accuracy. I’m just not sure that a monocoque receiver group offers that much of an improvement over say a beefy upper and solid handguard or a monolithic upper and a traditional lower.
Looks amazing and shockingly expensive though.
Pretty sure this is intended to eliminate POI shifts caused by upper/lower receiver play, so Colt’s monolithic upper doesn’t do the same thing this is meant to do. Admittedly this seems like an absolutely unnecessary concept, but better shooters than me might benefit from it at extreme ranges.
It does seem like basing the handguard off the lower would be a much better way to reduce bipod loading on accuracy components than going with a monolithic receiver. If you still want to maintain the long rail for optics, just use an upper receiver extension.