I stole this from a post by Olympic Arms on another forum.
Coming October 1st 2011 the UMAR (Ultimate Magnum AR) will be released to the public.
It will feature:
A 24” match grade bull barrel made from 416 stainless steel
Predator Rifle length Handguard
FIRSH (rail) mounted sling swivel
Gas Block with rail
ERGO Tactical deluxe pistol grip
Proprietary 5 round caliber specific magazine
Proprietary lower receiver
Twist Rates .22-250 REM (1x14) .223 WSSM (1x14) .243 WSSM (1x10) .25 WSSM (1x10) .300 OSSM (1x12)
This proprietary lower receiver design has an elongated magazine well to fit the larger 22-250 round as well as a .300 OSSM with a 168 grain bullet.
The top lower is a standard magazine well and the bottom is the UMAR Lower.
The UMAR lower receiver will accept MIL Spec upper receivers and standard magazines. The bolt catch hole has been threaded so you can easily change out the bolt catch when switching from a 22-250 or WSSM/OSSM to 5.56 NATO, 6.8 SPC, etc.
This will MSRP at $1428.70