M4 compatibility for internals and externals

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witchcraft58a

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Hi all,

Just starting to understand M4 custom builds, I'm just wondering if G&G internals (gearbox, hop unit etc.) would fit into a G&P receiver? 

Any other compatibility issues to watch out for?

Thanks!

 
Most bog standard V2 internals will fit in  V2 receivers. You may find that you need to shim the rear of the gearbox to the receiver to stop it tipping nose up when tightening the buffer tube screw, but that goes even on parts from the same manufacturer.

Gearbox internals can be bit more problematic.

 
witchcraft58a said:
Hi all,

Just starting to understand M4 custom builds, I'm just wondering if G&G internals (gearbox, hop unit etc.) would fit into a G&P receiver? 

Any other compatibility issues to watch out for?

Thanks!
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Outer barrel compatibility may be more of an issue for you. G&P receivers use a tapered fitment that works with their own tapered barrels.

 
Lozart said:
Outer barrel compatibility may be more of an issue for you. G&P receivers use a tapered fitment that works with their own tapered barrels.
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Well, some of them do...

What else adds to the confusion... Oh yeah! Most AEGs use a particular thread for the barrel nut, or at least something close enough that the barrel nut will generally wind on. But there's a few manufacturers who use the same 'real steel' thread that's often used on GBBRs.

 
Hangtight said:
Well, some of them do...

What else adds to the confusion... Oh yeah! Most AEGs use a particular thread for the barrel nut, or at least something close enough that the barrel nut will generally wind on. But there's a few manufacturers who use the same 'real steel' thread that's often used on GBBRs.
Click to expand...
Click to shrink...
Can confirm this, G&P's barrel nut thread would not allow the proper fitment of a nuprol MK18 rail's barrel nut (which was needed), simple fix, use the old one and sitck the rail to the barrel nut with PTFE tape to wedge it on :)

 
Corky2110 said:
Can confirm this, G&P's barrel nut thread would not allow the proper fitment of a nuprol MK18 rail's barrel nut (which was needed), simple fix, use the old one and sitck the rail to the barrel nut with PTFE tape to wedge it on :)
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Such a common problem that Madbull do a thread tool to correct the threads...

 
Thanks for the replies, defo more of a minefield than I was expecting!

Does anyone have an idea about G&G compatable M4 receivers?

 
I'm planning on getting some new externals such as an external barrel and handguard for my G&G SRS. What brands are compatible with g&g and would work for what I'm trying to do?

 
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