Nearly two decades ago, gunsmith/designer Fred Craig teased a new pistol design – the gas-delayed M11 Merc. Alas, this turned out to be vaporware. In the mean time, Craig has done a fair amount of prototype work for Armscorp (Rock Island Armory). The .22 TCM cartridge and the XT22 .22 Magnum pistol have been the most obvious fruits of their combined labor.
Imagine my surprise when I found the March/April 2023 issue of American Handgunner in my mailbox on New Year’s Eve. The covergun is the new RIA 5.0 ST pistol. I immediately thought that it might be a resurrection of the M11 Merc, but the article quickly noted that the new pistol was a short-recoil design, not gas-delayed.
As soon as the cobwebs in my brain cleared, I remembered a 2018 patent awarded to Craig and RIA’s Martin Tuason: US Patent #10,018,433B2.
The locking system is deceptively simple. A piston-like locking piece engages the front underside of the barrel assembly. The piston has a hole running through its side for a long spring guide rod. The chiseled nose of the guide rod engages an angled surface at the opening of the piston’s hole. The contact between the two surfaces causes the piston to withdraw from its locking engagement with the barrel.
So far, RIA’s website is not showing full coverage of either the RIA 5.0 SP and 5.0 ST. I have been able to glean some stats for the latter.
|Overall Length||8.11 inch|
|Overall Width||1.33 inch|
|Overall Height||5.17 inch|
|Weight||2.47 lbs/1.12 kg|
|Front Sight||Dawson Precision, Fiber Optic on dovetail cut|
|Rear Sight||LPA Adjustable on dovetail cut (also available with C More RTS II Red Dot Optic)|
Update: RIA has finally updated their website with additional photos and added pricing info. The iron-sight ST has a MSRP of just under $999, with the C-More equipped SP will go for ~$1,299. They also posted the following video: