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AndyRexia 02-27-2013 06:57 PM

I currently have a carbine length AR-15. I have a free float quad rail and a low pro gas block. I want to turn my upper into a dissipator upper. I'm thinking I will need a barrel nut, delta ring assembly, a handguard cap, and a front sight assembly. Oh and rifle length handguards. What am I missing?

AndyRexia 02-27-2013 07:02 PM

BCM has all of those parts except handguard cap. I'm wanting to put black rifle length MOE handguards. Would I need round or triangle cap?
BCM has two front sight assemblies.

I would need the taper pin set too? I want to make sure I get all the parts I need. Those sights are to different sizes. What are the differences?

JonM 02-27-2013 07:31 PM

Your barrel has to be cut with the proper reliefs for a fixed fsb. Not all are.

AndyRexia 02-28-2013 12:07 AM

So you're saying it would be a pita?

JonM 02-28-2013 12:16 AM

no. you just need to contact the barrel maker/supplier to see if your barrel has been profiled to mount a fixed fsb if you plann on using one.

bluez 02-28-2013 12:49 AM

For a true dissipator dont you have to move the gas hole on the barrel as well?

SSGN_Doc 02-28-2013 02:58 AM

You could get a clamp on front sight, like a folding one from PRI or YHM.

4thPointOfContact 02-28-2013 03:05 AM


Originally Posted by bluez (Post 1157168)
For a true dissipator dont you have to move the gas hole on the barrel as well?

That kinda depends....
You could build a dissapator with either a carbine or a mid-length gas system, which remains intact (in the same place) while a front sight base is affixed in front of it. The forward FSB isn't connected to the gas system, of course.

AgentTikki 02-28-2013 04:31 PM

Yes a true dissy will have a rifle gas system. A mock dissy will have to have 2 gas blocks if you want a fixed FSB up front.

4thPointOfContact 02-28-2013 04:59 PM
Easier than a thousand words, right?

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