Quote:
Originally Posted by turok_t
Thanks for the reply Tyson! Much appreciated. Does Part #66 do anything on a WE M4? I know that when the hammer is cocked, it pushes up Part 66, allowing the firing pin to thrust forward when the hammer hits it. When the hammer is already in the forward position, Part 66 is permitted to be pushed down by the spring blocking the knocker from retracting. The thing is, the back plate of the valve knocker already prevents it the knocker from going backwards. So does Part 66 do nething except for facilitating the function that is already there? Im just thinking about what would happen if it is removed.
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I'm not sure that your description of things is correct...or that I'd do a better job at describing things.
Part#66 is critical to the functioning of the system.
When the hammer goes forward it strikes the knocker...the knocker is spring loaded to snap back rearwards, but is held forward. You can observe that by cocking the hammer back just a bit and you'll see that the knocker stays forward (i.e. it would still be holding the knocker valve of the mag down...as gas would be flowing).
If you were to take the trigger mech apart you would note a little bump on the hammer. This bump interfaces with the lower leg of Part #66. The bump bumps the leg and part #66 kicks the knocker out of position and it springs back (retracts back). When it does this...that effectively shuts off the gas from the mag. You can observe that by cocking the hammer back bit by bit until part#66 causes the knocker to flick back into it's reset position.
I did miss in my previous e-mail that it is possible that a sharp corner of aftermarket Part#66's can wear out the nub on the hammer...causing things to fail. You can see if that nub is worn by taking the part #66 out of the trigger mech and by cocking the hammer while the trigger mech is out of the receiver. You should be able to look into the hole on the side and see the condition of the nub. A pre-emptive move would be to round the contact edge of aftermarket CNC'd part #66's...so that it doesn't wear the hammer. All it needs is enough of a bump to kick the knocker out of position.
Compare a stock part #66 with some of the aftermarket CNC steel part#66 and note the rounded corner of the leg.