Quoted: A few questions..
1) Rivets, who has the best set of them?
2) Recievers, Ohio Ord, or Global? which one is the best choice?
3) Triggers, it is my understanding that these kits come with full auto trigger groups. Is this true and who has the best deal on the compliance kits?
4) Underfolder, I gotta have one. Do you build these on normal rec's? or is there a special reciever for underfolders?
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1) You can get good rivets out of the EE here, or from Global Trades. Although TAPCO has recently changed to decent rivets from the old Thumbtack headed ones, but I'd be sure you specify the new rivets if you order from them. I ordered 2 sets to check them out recently and got one new style and one old style (the old style long rivets are trash)
2) This one is kind of like who's religion is better, but IMO the Global receiver is the better choice. Ohio has their selector hole too low, you have to modify the tab on your selector arm to get it to work and I think that sucks... so Global is and has been my choice.
3) Yes and No, depends on the kit you order, who you got it from etc. It may have a full auto trigger group with it, but you can still use the parts needed for a semi-auto build, however you likely need a US trigger group for 922 compliance. Tapco has a great FCG, although dpharms.com or midwestarmory.com are cheaper than TAPCO on that item. dpharms also has the Century US compliance pack for arouund $38 which is a US pistol grip, gas piston, and Century FCG... It's really a pretty good deal. The Century disconnecter has a tail on it that needs to ground off with a dremel or bench grinder to avoid trigger slap, but not a big deal it's a 5 minute fix.
4) The underfolder stock builds onto a normal receiver but you have to make extra holes for it. Build a fixed stock first and tackle putting an underfolder on a later build. However don't build a fixed stock to convert as the rivet holes are not in the same place for a fixed stock rear trunnion and an underfolder trunnion. ** Also you can get a Rommie sidefolder stock that while not an underfolder, does fold to the selector arm side of the weapon and simply screws to the tang on the normal trunnion.