I got the checkered arch mainspring housint to replace the flat one that came on my RIARock Ultra 10mm AUTO. The arched housing fits my hand better and helps with an instictive grip that doesn't want to shoot to the left. I wear size XL gloves by the way.
The housing itself is very well made and comfortable to shoot with the 25lpi checkering being just aggressive enough to aid with recoil control. It installed easily with a tight fit no fitting required.
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