A2 receiver to flat top [Archive] - Glock Talk


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12-13-2010, 12:09
Good day all,
My question may seem a bit elementary to some but I need to ask any way. I have several AR rifles, and only one is the A2 type upper receiver with carry handle. I want to change the upper to the A3 style I noticed that most receivers these days have M4 cuts would this affect the function with out installing an M4 barrel extention? :brickwall:

12-14-2010, 01:04
The extension will over-hang the receiver and could catch the tip of the bullet but, you can use a chainsaw file or a dremmel to match the ramps of the extension with the M4 ramps of the receiver.