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Nicholas, I,m sorry but the colt M4 22lr isn't list as compatible. Here's the list Fits: Ruger Models: 10/22 77/22 96/ 22 Charger Pistol American Rimfire Rifle

it fits Ruger rotary magazines guns which are not even close to the colt style magazine

This will not fit as it has a totally different magazine tower and feed lip geometry Nicholas.