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3/20/2017 5:03:23 PM
Posted: 4/4/2012 5:55:32 PM EDT
I am going to swap my A2 frame AR to a A3/A4 flat top receiver and had some questions. I have taken a lot of ARs apart before to make various upgrades. Do I just need to remove the flash hider, front sight and use the armorers wrench to remove the castle nut? Any advice or tips would be helpful. Thanks!
Link Posted: 4/4/2012 6:06:46 PM EDT
If your AR has standard handguards and not some sort of free float rail, you'll only need to remove the handguards, remove the gas tube, and loosen the barrel nut with your wrench.
Link Posted: 4/4/2012 6:11:50 PM EDT
Awesome thanks!
Link Posted: 4/4/2012 6:19:00 PM EDT
Make sure you purchase a flat top receiver that is compatible (rifle or M4) with your barrel extension's ramps.
Link Posted: 4/4/2012 7:22:56 PM EDT
Yea I purchased the the compatible receiver from the same
Manufacturer that makes my rifle so I should be good there.
Link Posted: 4/4/2012 7:25:01 PM EDT
Originally Posted By TannerPNW:
Yea I purchased the the compatible receiver from the same
Manufacturer that makes my rifle so I should be good there.

You will be. All of ArmaLite's upper receivers and barrels have M4 feed ramps. Good choice of rifle, by the way. ArmaLite is my favorite.
Link Posted: 4/4/2012 8:55:45 PM EDT

Originally Posted By 86HMMWV:
Originally Posted By TannerPNW:
Yea I purchased the the compatible receiver from the same
Manufacturer that makes my rifle so I should be good there.

You will be. All of ArmaLite's upper receivers and barrels have M4 feed ramps. Good choice of rifle, by the way. ArmaLite is my favorite.

Same Here, wonderful guns, great service.
Link Posted: 4/5/2012 2:40:24 AM EDT
Originally Posted By w15ly:

Originally Posted By 86HMMWV:
Originally Posted By TannerPNW:
Yea I purchased the the compatible receiver from the same
Manufacturer that makes my rifle so I should be good there.

You will be. All of ArmaLite's upper receivers and barrels have M4 feed ramps. Good choice of rifle, by the way. ArmaLite is my favorite.

Same Here, wonderful guns, great service.


Agreed as well.
Check my avatar.
Link Posted: 4/5/2012 8:56:09 AM EDT
I'm swapping that receiver out to drop a scope on it. Do you guys have any recommendations for optics? I have always been partial to Leupold but would be open to others. It would mainly be for targets at or around 100 yards. Also do you think I should take that front sight off and swap for a railed gas block?
Link Posted: 4/5/2012 9:05:11 AM EDT
Originally Posted By TannerPNW:
I'm swapping that receiver out to drop a scope on it. Do you guys have any recommendations for optics? I have always been partial to Leupold but would be open to others. It would mainly be for targets at or around 100 yards. Also do you think I should take that front sight off and swap for a railed gas block?

I would look at a 1x-4x....possibly illuminated.
Several good choices in this class, depending on budget.

The illuminated Vortex PST is getting good reviews....$500

Millet
Weaver
Nikon
Burris
Leupold

The FSB will fade out of focus at about 3x.....I would try the optic with the FSB still in place and see how it is.

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