Done both. Recently cut off the sight on an A2 and installed a free float rail. As the rail covers the gas block it looks just fine. I have a Leupold VX-R Patrol with magpul MBUS.
Do a search, simple enough to do. Took me about half an hour........but get some new pins before you start as it is easy to goon up the pins taking them out and makes for a more secure job with the new pins. I didn't have to heat or do anything extra to get mine apart to do the work.
Last edited by Chorizo; 08-31-13 at 22:31.
USMC, 21 years and 21 days. But who was counting?
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