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Thread: converting to a flattop reciever, how??

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    converting to a flattop reciever, how??

    hey guys, i have a 5-10 year old bushmaster carbine with fixed stock,fixed carry handle, regular 16" barrel and standard a2 triangle front sight. i want to buy a bushmaster v match flattop upper that has the forward assist and ejection port cover already assembled (part#VUR). i want to mount optics but hate mounting on top of carry handle(tried it already). what tool(s) do i need from the bushmaster catalog to remove the barrel or anything else i may need to install this at home. i'm seeing a few here: heavy duty combination ar15 armorers wrench $ 22.50 part#1570 or armorers barrel wrench $11.95 part#rm-001. i already have a ton of regular wrenches and a good craftsman digital torque wrench good for 250 ft.lbs. also what can i expect and any tips or tricks to make this a smooth process?
    Last edited by goodale; 12-09-08 at 18:06.

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    Watch these Brownell's videos.

    Section 5.

    http://www.brownells.com/aspx/NS/Gun...p=0&t=1&i=1103
    Last edited by JBnTX; 12-09-08 at 18:48.
    "We make war that we may live in peace."
    -Aristotle

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    Those videos are a great resource. Thanks!

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    Upper Swap

    Guy I know was in the same situation. He sent it to Grant at G&R Tac and he swapped the uppers out for a very small fee (the new upper was bought from Grant).

    If you retain the FSB, you'll want to intall a taller front sight post, which is what was done in the above case (again purchased at G&R). It cost less than $10.



    If you're going to do this as a one time job, just pay a small fee for someone else to do the work, and have it done right the first time. If you're going to work on a lot of ARs, then get the tools to DIY.

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    You'll also need vice blocks.

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    alright so still no clear answer here. can i do it at home with a barrel wrench? i live in nj, its hard to find gunsmiths around here and the one i did find dosnt want to work on any assalt type weapons because when the state police come he says they give him a hard time and start asking a lot of questions......unreal. SO i wanna just do it myself, its a one time deal. so the fewest tools i can get away with the better. help?

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    Quote Originally Posted by goodale View Post
    alright so still no clear answer here. can i do it at home with a barrel wrench? i live in nj, its hard to find gunsmiths around here and the one i did find dosnt want to work on any assalt type weapons because when the state police come he says they give him a hard time and start asking a lot of questions......unreal. SO i wanna just do it myself, its a one time deal. so the fewest tools i can get away with the better. help?
    yes as long as you have a vise ,upper clamp ,barrel wrench,torque wrench


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    alright cool thanks warpig, can you give me a run down on a upper clamp? who what where how much?

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    http://www.brownells.com/aspx/ns/sto...20VISE%20BLOCK


    http://www.adcofirearms.com/itemdeta...orynumber=1626

    2 different types here.

    the barrel wrench you can pick up anywhere for about 10 bucks for a GI model
    just take your time and read as much as you can ,the videos on the brownells site are dead on for the swap ,just remember 30FT/LBS on the barrel nut
    Last edited by warpigM-4; 12-11-08 at 16:08.


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    bah- 100 bucks gets you all the tools you need to do whatever you want to any AR15. that's chump change to be able to do all your own work. roll pin punch set, armorer's wrench, torque wrench, grease, blue loctite. AND you know how to do it, for future builds.

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