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m102404 · September 19th, 2009, 11:44

Updated the WE AWSS M4/SCAR tech thread

UPDATE

***EDIT Sept 19, 2009***
Due to a happy mistake, I received a new nozzle and brass chamber for my M4 AWSS. Unlike my stock gun, this nozzle was shaped just like the SCAR AWSS nozzle in that it was stepped and wider at the body. It was mounted on a long (regular) M4 rod and piston unit though...odd. The short SCAR length rod was included in a baggie...so I wonder if it comes that way or if they mix and match at the factory. Anyways...although disappointed at first, I tore into my M4 and compared the parts. The cross pins and external cuts/dimensions matched between the "SCAR" unit and the "M4" unit. Yeah! As long as you use the "SCAR" nozzle with the "SCAR" brass chamber/tube (and similar for similar in the case of the M4 parts)...you're good to go...straight drop-in swap. I had cut my inner barrel to CQBR length and with the stock "SCAR" nozzle...FPS was bang on 400fps w/ 0.20g BBs.

***********************

As an aside...my WE M4 AWSS is acting up. Shortly after test firing with the "SCAR" nozzle/chamber it lost full auto and now isn't shooting semi at all. The knocker isn't traveling forward enough to hit the valve on the mag. Without a mag in it appears like it acts/resets/fires fine...but with a mag in I get a hammer drop but no-joy. Racking it manually with the charging handle resets it (and trips the knocker in the first few mm's of movement). I kind of wonder if I haven't tightened something down too much....or perhaps something has worn. The parts that bear against each other are "rubbed" (i.e. metal to metal contact, slight or evident shiny-ness)...but don't really look worn out. If someone can point me to a good how-to on removing and disassembling the trigger group I'd appreciate it...I hope I'm doing it right. I'll disassemble and reassemble not-so-tight...and see if introducing a little play into things doesn't help.

HA...figured it out. If, after a lot of shots and taking your piston/bolt assembly apart several times, you notice that type of shot behaviour...check that the UHMW spacer that sits on the body of the piston (to keep it centered in the bolt) hasn't nudged itself up towards the front of the bolt. Mine was repeatedly moving up, sort of centering itself on the two holes of the piston body...moving it back fixed it all up. I replaced it with a new spacer (that isn't loose at all) and things work just fine now. It's probably because I've disassembled mine over a dozen times that it's loosened up...as new, it's a quite a tight press fit.

September 19th, 2009, 11:44	#217
m102404 Tys Trader rating Join Date: Apr 2006 Location: Toronto	Updated the WE AWSS M4/SCAR tech thread UPDATE *EDIT Sept 19, 2009* Due to a happy mistake, I received a new nozzle and brass chamber for my M4 AWSS. Unlike my stock gun, this nozzle was shaped just like the SCAR AWSS nozzle in that it was stepped and wider at the body. It was mounted on a long (regular) M4 rod and piston unit though...odd. The short SCAR length rod was included in a baggie...so I wonder if it comes that way or if they mix and match at the factory. Anyways...although disappointed at first, I tore into my M4 and compared the parts. The cross pins and external cuts/dimensions matched between the "SCAR" unit and the "M4" unit. Yeah! As long as you use the "SCAR" nozzle with the "SCAR" brass chamber/tube (and similar for similar in the case of the M4 parts)...you're good to go...straight drop-in swap. I had cut my inner barrel to CQBR length and with the stock "SCAR" nozzle...FPS was bang on 400fps w/ 0.20g BBs. *********************** As an aside...my WE M4 AWSS is acting up. Shortly after test firing with the "SCAR" nozzle/chamber it lost full auto and now isn't shooting semi at all. The knocker isn't traveling forward enough to hit the valve on the mag. Without a mag in it appears like it acts/resets/fires fine...but with a mag in I get a hammer drop but no-joy. Racking it manually with the charging handle resets it (and trips the knocker in the first few mm's of movement). I kind of wonder if I haven't tightened something down too much....or perhaps something has worn. The parts that bear against each other are "rubbed" (i.e. metal to metal contact, slight or evident shiny-ness)...but don't really look worn out. If someone can point me to a good how-to on removing and disassembling the trigger group I'd appreciate it...I hope I'm doing it right. I'll disassemble and reassemble not-so-tight...and see if introducing a little play into things doesn't help. HA...figured it out. If, after a lot of shots and taking your piston/bolt assembly apart several times, you notice that type of shot behaviour...check that the UHMW spacer that sits on the body of the piston (to keep it centered in the bolt) hasn't nudged itself up towards the front of the bolt. Mine was repeatedly moving up, sort of centering itself on the two holes of the piston body...moving it back fixed it all up. I replaced it with a new spacer (that isn't loose at all) and things work just fine now. It's probably because I've disassembled mine over a dozen times that it's loosened up...as new, it's a quite a tight press fit. Last edited by m102404; September 19th, 2009 at 14:25..