Cant close M16A4

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aquestr

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I dissassembled it without taking the gearbox out, just wanted to check the hop up. I tried to reassemble it but the upper and lower wont quite fit, they are almost close but cant close it. I even tried to close it without the barrel, annoying bolt catch, and the charging handle, but even without these pieces it wont close. Could you help me? Here is a pic:

IMG-20190127-201313.jpg

Thanks

Edit: its a King Arms with a "functional" bolt catch, tho I removed it for this.

 
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Long shot but is this an ICS split gearbox? You need to make sure the sector gears teeth are not pointing up. 

 
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Assuming nothing is obstructing it then my G&P takes a lot of force to align before I drive the locking bolt through. A three hand job (especially as it has one of the nasty 3 part bolts).

 
Its a King Arms, the one with the "functional" bolt catch. I already tried the force method, tho not sure if should apply more, I dont want to break anything.

 
pull the charging handle back a bit, it catches on the king arms one, then you need to make sure you press the back of the upper down as the alignment tabs need to be under the lower reciever.

 
Same principle as the G&P (purely as an exmaple) I mentioned too. ?

 
Immortal said:
Oh I wondered why they made them like that. Thank you for enlightening me! ? I will stop cursing them now. lol :lol:
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yeah, it's a common problem and the split pin is the only system i've seen truly eliminate it. ofc on the real ar it's not any kind of problem because the barrel, bolt and sights are all securely mounted to the upper so it doesn't matter of the lower wobbles a bit.

 
I managed to do it. The problem seems to be that the fitting is extremely tight so I beveled it a bit so it would carry it to its place instead of smashing the 90 degree angle against the other 90º degree angle. It seems to work.

 
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