I have a STD XCR-L (in my profile picture) that has STD gas. I had a 12in barrel I sent in for RMA and it got lost in transit. I have an 11in on order, but it going to be forever. I just found this website and was hoping I could find a 9.5" 1:7 type 3 conversion with op rod/spring and gas tube to convert to a buried gas block, or just an 11in 5.56 1:7 with exposed standard gas block type 3 that I could have a gun I could shoot. RA did have an 11" 1:9 type 3, but shooting suppressed and 60gr and heavier I decide against it. Please let me know what you have. I may potentially entertain other calibers kits too.