If you must have tandemkross - TANDEMKROSS Tomahawk Hooked Bumper, Ruger MKIV 22/45

first off do not buy the regular mk iv 22/45 bases. I did write a review on those. I suggest you read it. but, the Tomahawks are good except for one issue. there’s a hole molded into the base before you get to the locking pin hole .. so you have to stick a screwdriver through the magazine slide and lift the locking pin up a little to get them passed the 1st hole to get them seated completely, which is a little ridiculous . once installed they are great. fyi, The hook is meant For your left hand, not your right hand ( or not for your primary hand ) if you’re wondering why the hook is so far away when you hold the gun .