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This is my new knex gun the M4A1 Carbine Assault Rifle it's one of a kind it has a adjustable stock, a charging handle that pulls back the ...
K'nex M4A1 Carbineby Fartonia
K'nex Ball Machine Lift: Giant Ball Catapultby Mechanical Master
Knex M4A1 Carbineby OrionPax43
knex m18d rbg semi assault rifleby JDproductions
Knex M4A1 Carbine (virsion from Fartonia's)by M4A1DrumRoll
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