Just got my first AR! Bushmaster Carbon 15. http://www.budsgunshop.com/catalog/product_info.php/products_id/80172

 

 

 

So now I have a question... I want to replace the stock gas block with a quad-railed one, so I can attach a flip down front sight, and a couple other accessories. Everywhere I go, it says the only way I can be sure of the size I need is to remove the current gas block and measure the hole. Is there any other way? I'd really rather order the gas block, and put it on when it arrives, only taking it apart once. And to be honest, I'm not all that confident I could accurately measure the hole.  Any advice would be greatly appreciated!

 

Also, I feel I have to say this since you can't tell from the picture, that's a PERMANENTLY PINNED 15 round mag, NOT a hi-cap 30 round mag! Purchased from RifleGear.com!!! 

Simple (I think) - just call Bushmaster Customer service and ask for technical assistance

 

For General Question, Parts or Repair:
Customer Service: 1-800-883-6229 
Mon. through Fri. 9:00 am - 5:00 pm EST
Technical Support:[email protected]
Company Information:[email protected]

You could also go with a quad rail fore stock.....................

I'm fairly certain I found the size (.625) but I'll deff call them before I do any parts ordering. Unfortunately, in a quick search, I can't find any quad rail gas blocks in that size, so I may need to go with a quad rail fore end anyway. 

Yea, it looks like I'm gonna have to change out the hand guard. Probably going to do what this guy did when I get the money. http://www.ar15.com/forums/t_3_118/550889_Bushmaster_Carbon_15_Superlite_Freefloating_handguard.html

Thoughts on this?

Why don't you keep the existing gas block and just trim it with a Dremel so the ff rail fits over it.

 

You can even get a rail that uses the existing barrel nut which makes the install a lot easier. This is a Troy Bravo rail.

I believe YHM make a quad rail GB in .625