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Jerek - you can install pretty much whatever length hand guard you want, provided you replace the gas block with a low profile gas block, if you are installing a longer rail. And, Jerek - on a .308 rifle, a 1:10 twist rate barrel is pretty much what you need for any commercially available 308 bullet available. 308's are different than the smaller .223. I'm sure Michael was thinking of 5.56/.223 when he mentioned the 1:7 or 1:8 twist rate barrels.

Yes it will fit with no other mods necessary

Jerek, This firearm will take any carbine length quad rail. You could even put a longer one on if you replace the front railed gas block and install a low profile block that rail will go right over. Just one thing about this barrel having a 1 in 10 twist may not handle heavier projectiles. Lot of super comparable price and quality ARs here that have 1 in 7 or 1 in 8 twist barrel rifling that would make firearm a little more versatile.

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Hi Jerek, Yes, This will fit this Carbine Length Rifle same as your 16" Windom Weaponry R16m4

Jerek, yes Sir it will fit this Carbine Length Rifle same as your 16" Windom Weaponry R16m4