custom m4

[mad212]

right i want to change the fore end on my m16 to a railed m4 fore end. would my current m16 inner barrel be okay in a G&P Xm177 e1 forend?

[FryFubar]

Re: custom m4

The M16 inner barrel is going to be longer than m4/xm177/m773 inner barrels. Just add a suppressor and you should be fine (long or medium suppressor).

[mad212]

Re: custom m4

what lenght tightbore do m4's take?

[Will_0]

Re: custom m4

343 mm

[ejtrent]

Re: custom m4

It's actually 363mm

[johnnyj]

Re: custom m4

tbh it depends on the m4

cqb 280
m733 300
m4a1 363

[FryFubar]

Re: custom m4

TM M4s are 363mm whereas the M773 is 300mm and the Car-15 is 247mm and compared to the M16 which is 509mm

[sj_asc]

Re: custom m4

The XM177 is also 300mm, if you want to run the full 509mm M16 length barrel through that you will need to ensure that the extra length is properly supported e.g. using barrel spacers inside the suppressor.