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AR15.COM
AR Sponsor
1/15/2010 3:42:36 PM EDT
Hi,  recently started building my first ar 15.  I am starting with a S&W lower and am in the process of ordering a 16'' m4 del ton upper rifle kit.  I was thinking of ordering with the regular CAR stock hand guards and upgrading to a free float four rail in the near future when the money came around.  I plan on using a YHM diamond spector(longer version to cover a carbine's gas block area) free float tube.  What type of gas block should I use instead of the A2 regular front sight?  Reason being, I do not want to go through scratching my barrel to take off the A2 when my new free float gets here.  Should I use a low pro gas block to slide underneath the new free float or do I need to purchase a YHM spector gas block to fit under the rail?  Any help would be greatly appreciated. If you couldn't tell, I am a complete rookie haha.  Also what is considered to be a legal barrel brake in MA?  I know it must be pinned or welded is anything that is not a flash suppressor legal as long as it is pinned or welded on permanently?

Sean
AR Sponsor