Fiberglass but it also depends on how much fiberglass sheets you use. 2-3 makes it very strong. rondo can take up a lot of space and add a lot of weight to get the same strength. I use a little of both add a little more resin to the bondo and use the runnier bondo instead of the fiberglass resin...
Hey M-071, the M247H (aka Jorge's gun) is a 7.62x51 mm(or a .308 civilian round). just thought you would like to know that it isn't a 50 caliber round for that prop.
http://halo.wikia.com/wiki/M247H_Heavy_Machine_Gun
as an A5 owner my self i have to agree with Frosty. Build a clam shell for the reciever but for things like the upper rail you can just build that as one piece. Also you could try and make a DMR(prop) mold two haves and go from there. you are also going to need an electronic trigger and a...
No im not but i was still testing while its in paper form, but ive started to conside making the inisde out of rubber so it should still work, but thanks for the help