A2 to A4 upper question.

[darbn]

I have a RRA NM A2. Can I change just the A2 upper reciever to a flat top without changing the performance of the rifle. The only reason I ask is because it is a national match.

[warpigM-4]

well first you would need to get one with or without the extended Feed ramps depending on what you have .Plus you would Need a taller front sight post if you have the standard FSB if you plan on using BUIS .But I think you would be GTG

[markm]

Can I change just the A2 upper reciever to a flat top without changing the performance of the rifle.

No. The flat top upper will flex much more than the A2. Especially on a rifle with the long barrel. If you need a flat top for mounting some optic, spring for the VLTOR MUR. It's a stronger flat top upper.

[warpigM-4]

Good Point MarkM I didn't know that. I learn something new everyday here

[darbn]

Thanks for the info guys. I am still on the fence but leaning toward wanting a nice optic on this one.