Welcome to Northwest Firearms
Join our community, sign up for free today!
Sign Up

AR hand guard swap

hey guys I’m wondering if someone can help me out with something. I currently have a rainier arms hand guard on my AR and want to swap it out with a longer one. My question is will i need to change barrel nut as well. I’m looking at the dirty bird SMRS slim mlock. Does anyone know what barrel nut that one takes or can you tell me if my current one will work. Just trying to see how big of a job it’s going to be to swap hand guards


Current barrel nut
Last edited:
Those two pictures are of a standard AR barrel nut. You would have to research or ask the manufacturer if they use a standard or a proprietary barrel nut to get your answer.



  • Rangemaster Gunworks
    5.00 star(s)
    I have done business with Jeff for many years,he is trustworthy and honest
    • grpolarbear
  • Rangemaster Gunworks
    5.00 star(s)
    I've known him from the beginning. I trust him completely. His prices are fair. He is technically competent in all aspects of gunsmithing and...
  • Country Line Shooting Sports
    5.00 star(s)
    If you like a good mom and pop, country store, County Line only lacks the cracker barrel and chairs to be damn near perfect. They try and for the...
    • CptPh0t0n
  • Brimstone Gunsmithing
    5.00 star(s)
    David is kind, considerate and a true professional as are the rest of his staff ! Thanks
    • LuLuBelle
  • Brimstone Gunsmithing
    5.00 star(s)
    Back in April, I had Brimstone do a Tier 1 trigger job for my 10/22 race gun build. After months of use and a handful of speed steel events, I...
    • Mister Bisley

Staff online