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Thread: Help is need with an Upgrade Project to convert a A2 CAR to a Flatop

  1. #1
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    Help is need with an Upgrade Project to convert a A2 CAR to a Flatop

    I have a Bushmaster 11.5 inch Heavy Barrel with a 5.5 CAR Flash Hider that has been worked over and its very accurate and reliable after several growing pains. I purchased the carbine back in 1999 and the upper receiver is a A2 without m4 feed ramps. Now here is my issue I would like to swap out the A2 upper to a Flat top but since the barrel does not have the M4 feed ramp on the barrel extension I either have to get a new barrel extension plus the tool to do so plus the receiver. I would like to just do a upper receiver swap and keep the cost to a minimum since I am also working on a 18 inch SPR clone with all the bells and whistles. Any one know of someone selling a solid A3 upper without the M4 feed ramps?

    thanks.
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  2. #2
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    Since you are bound and determined to keep the BM barrel.

    http://www.tacticalinc.com/flat-uppe...le-p-1133.html

    Quote Originally Posted by af22raptor View Post
    I have a Bushmaster 11.5 inch Heavy Barrel with a 5.5 CAR Flash Hider that has been worked over and its very accurate and reliable after several growing pains. I purchased the carbine back in 1999 and the upper receiver is a A2 without m4 feed ramps. Now here is my issue I would like to swap out the A2 upper to a Flat top but since the barrel does not have the M4 feed ramp on the barrel extension I either have to get a new barrel extension plus the tool to do so plus the receiver. I would like to just do a upper receiver swap and keep the cost to a minimum since I am also working on a 18 inch SPR clone with all the bells and whistles. Any one know of someone selling a solid A3 upper without the M4 feed ramps?

    thanks.



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  3. #3
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    I've used this $89 RRA reciever recently to do much the same thing.
    http://www.pkfirearms.com/Upper_Receivers/25/c
    Last edited by karlb; 01-10-12 at 12:41.

  4. #4
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    Do you have a sight base pinned to that barrel?

    Cause it's probably not F-marked, you might need a taller front sight post.

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    I want to thank Iraqgunz and karlb for the links. M16 the front base is not a F and I know that it would be an issue to use the iron sight but I have an extra Samson rifle length rail handguard and I was thinking that it might be cool to have the rail over the 16 inch barrel with Magpul Mbus front and rear sight. I was also considering getting one of the flip front base from YHM that are bolted on because this upper would be setup mainly for Home Defense, Range, and backup for 3g.

    When I first got the carbine it was a mess it could not fire more than 3 rds before it stopped but after 3 trips back to BM and letting a Salty Gunny Armorer take a look at it the carbine works like a Swiss timepiece now. The main issue was a undersized gas hole in the barrel.
    Si Vis Pacem, Para Bellum.
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  6. #6
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    Range Tool as A3 stripped uppers without M4 feedramps for $57. I recently purchased the M4 feedramp version from them and the quality looks the same as any other Mil-Spec reciever.
    http://www.rangetool.com/index.php?p...mart&Itemid=20

  7. #7
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    Would it not be possible to swap to to an M4 flatop upper with feedramps and simply grind some feedramps into the existing barrel extension? Then you would have the flatop with the M4 feedramps.

  8. #8
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    Quote Originally Posted by elephantrider View Post
    Would it not be possible to swap to to an M4 flatop upper with feedramps and simply grind some feedramps into the existing barrel extension? Then you would have the flatop with the M4 feedramps.
    I considered upgrading the barrel extension so that I could use a M4 feed ramp upper but but the extra cost of the extension and wrench was going to be more than what I wanted to spend on this upper since the upper was tuned by a Gunny buddy and works flawlessly. I keep going back and forth on changing the gas port to a low profile so that I can use a set of Magpul MBUS that I have but I think that I will keep it with the A2 front sight base and maybe change it out to a flip later.
    Si Vis Pacem, Para Bellum.
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  9. #9
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    Quote Originally Posted by elephantrider View Post
    Would it not be possible to swap to to an M4 flatop upper with feedramps and simply grind some feedramps into the existing barrel extension? Then you would have the flatop with the M4 feedramps.
    Don't do that. WECSOG never makes things better.

    I've done a number of these conversions. Get an upper that matches your barrel extension. You will probably need a taller FSP. Test fire the gun. Follow the normal PM and assembly precautions discussed elsewhere here at M4C.
    Last edited by ST911; 01-11-12 at 22:57.
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  10. #10
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    Quote Originally Posted by af22raptor View Post
    I considered upgrading the barrel extension so that I could use a M4 feed ramp upper but but the extra cost of the extension and wrench was going to be more than what I wanted to spend on this upper
    You can't do that anyway... The gas port is drilled after TDC is determined by the final position of the Barrel Extension. Changing extensions would put the gas port somewhere else.

    To make this work you'd spend more than the cost of a good upper half... BCM, DD, etc.
    "You people have too much time on your hands." - scottryan

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