krystofer66 Posted March 23, 2015 Report Share Posted March 23, 2015 Ok i am sure no one wants to read another handguard thread but i have read several and keep getting different answers. So long story short, I have a Colt/Umarex M4 carbine 22 lr. It has the polymer handguard. I am wanting to know if i can put regular mil spec AR free float handguards on these or do i need to go with the air soft kind. If so will i need to change out barrel nuts or anything else. A little clarification would be nice. i plan on looking for a mid length hand guard in aluminum for around 50$ and i would prefer top rail only types if anyone has a lead on one. Quote Link to comment Share on other sites More sharing options...
techmike Posted March 24, 2015 Report Share Posted March 24, 2015 Have to admit, I was confused my own self. * If you have a Colt M4 .22 that has a Delta Ring, you can put any 2-piece mil-spec hand guard on your rifle that is the correct length.* If you want to replace the existing free-float hand guard on the Ops model, you will have to change the OEM barrel nut with a standard AR15 barrel nut. * I had an airsoft hand guard on my Ops model that came with it's own barrel nut - that was because that specific hand guard, a Troy TRX, uses a different nut - because the external part of the nut is different.* The thread size of the Colt .22 M4 is 1-3/16"-16 - same as an AR15.Attached pics, nut on the right is the Colt OEM, one on the left is a standard AR15 nut. Also a pic showing the Colt with the nut removed. Hope this helps!TMEdited to add, there is an 11" free float rail available in the For Sale thread! Quote Link to comment Share on other sites More sharing options...
krystofer66 Posted March 25, 2015 Author Report Share Posted March 25, 2015 I will check out the for sale thread. I was wanting to go longer. So in theory i can take off the front sights fill the holes and replace with standard AR-15 furniture? Quote Link to comment Share on other sites More sharing options...
techmike Posted March 25, 2015 Report Share Posted March 25, 2015 Yep, remove the front sights, I used JB Quick Weld to fill the nasty holes in my barrel shroud, and get a standard barrel nut, or whatever your hand guard requires. Edited to add - an AR armorer's tool, or barrel nut wrench to tighten the new nut. Quote Link to comment Share on other sites More sharing options...
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