Knex M4A1

so yea first of all excuse my bad english, im from germany, after some hours i finished my m4a1 and im pretty proud of it ;) what do you think? i did some internals for you if youbwanna build it,

it shoots grey connectors and has a range of 120 feet with 5 64# rubber bands its pretty sturdy and a bit smaller than in real i think (about 80cm long)
what gun should i build next? write it in the comments ( no big snipers pls i dont have that much pieces )