M-110 copy/replica

[N Jensen]

I was considering of trying to put together a M110 copy on a DPMS upper and lower.

A3 upper and lower

Krieger Barrel

A-1 Stock with A2 butplate (non adjustable but is the right length)

2 stage trigger

 

Question is on the following parts, best parts to get.

 

4 rail hand guard to buy, I believe it should be 12 inches long.

Gas block

Front sight

Detachable carrying handle

 

Goal is either having it capable to shoot with a scope or with iron sights and be legal for NRA High power matches.

 

Any ideas would be great.