Noob question - m305 Tilt test failure *FIXED*

[Duncan71]

Hey all,

Noob question here - searched around but couldn't find anything. Bought a brand new M305. Did a tilt test on it. Action cycles back no problem, but from the rearward position can have trouble coming forward again. When the rifle is complete, I can charge the action hard, and the bolt and op rod will stay rearward - as though the bolt hold open has engaged (although it hasn't). Do I have a bent op rod? Doing some messing around with it if I tap the op rod at the front near the guide block it releases, or if I tap the rear of the charging handle it will release. Everything else on the rifle seems to be good.

 

[yomomma]

Could be binding at the bottom of the barrel with the operating rod. First thing I would do is check out the op rod guide and fasten if loose.

 

[yomomma]

https://youtu.be/kBaeIzrQWAA

 

[Duncan71]

Already knurled it using the punch method. It's fairly tight. Did not epoxy it though

 

[yomomma]

Could just try using some emery cloth

 

[gnmontey]

Isn't the "TILT TEST" nothing more than locking the action back and ensuring the gas piston moves freely?

M

 

[ColKurtz]

Isn't the "TILT TEST" nothing more than locking the action back and ensuring the gas piston moves freely?

M

That's what I thought too...

 

[jonh172]

Isn't the "TILT TEST" nothing more than locking the action back and ensuring the gas piston moves freely?

M

There's another tilt test to ensure the oprod moves freely also.
Done with no trigger group of course and in the stock to check for binding.

 

[Duncan71]

Fixed


So the op rod wasn't machine all the way properly... the underside have about 8mm long ridge where it looked like the cutting tool failed. I used a file to square it up. This was forcing the op rod at the very end of its cycle to travel upward and bind.