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Posted: 9/11/2010 2:13:13 PM EDT
I found one for an E4. I have the STG-556 that take AUG/MSAR mags
Link Posted: 9/11/2010 2:21:34 PM EDT
I pretty sure they are compatable. I think the only thing(s) that seperate the two would be the stocks(and reciever locks. rounded and square). All other parts should be compatable.
Link Posted: 9/11/2010 2:28:02 PM EDT

Aren't the E4's bolt hard chromed, as well.
Link Posted: 9/11/2010 2:37:25 PM EDT
I think the newer one's are. Mine isn't though, since I sent in my stg for the E4 upgrade. It still runs great so I dont think it matters.
Link Posted: 9/11/2010 2:51:46 PM EDT
My E4 bolt is hard chromed but I am left handed and ordered a LH bolt. When it arrived I noticed it was NOT hard chromed (it was parkerized) but had a stainless extractor.

MadDog
Link Posted: 9/11/2010 3:05:13 PM EDT
The only difference between the MSAR STG and E4 models is the stock, all the other parts are compatible.
Link Posted: 9/11/2010 4:35:35 PM EDT
An E4 bolt will work in an STG and vice versa.

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