hell 4th there is tons of AR-15 goodies on the market-- what are ya wanting to assemble?
for tools i like the channel-locks and electrical tape, a small hammer and a cheap barrel wrench , don't forget the 30 pack and the pork rinds!
PS 4th are you wanting to build a 20" rifle or a 16" carbine or middy? tons of uppers at DSA/JSE and PSA or do you want to build an upper?
humm-- now 4th we know you got those shorties so you got the paper so adding a 14.5" M4 wouldn't cost $$ would it?
DSA has a very nice 14.5" m4 upper out. i built one of these and it has jumped to the top of my fun to shoot list. i had to pin and solder a longer than normal FH to get the correct 16"+ length. you shouldn't have to put up with such BS cause you got the stamp --i am a thinking.
this is 100% ninja now at a real-world price--LOL!
DSA ZM4 Forged 7075T6 A3 AR15 Upper Receiver 14.5" - DSZM4CBU14-D S Arms