M305 problem -- firing pin tap on primer

[Tengoo]

I put 25 rounds though my Norc M305 today, and had some issues:

1] When a round cycles into the chamber either manually or on firing, it gets a very light mark from the firing pin on the primer. This seems to happen every time.

2] About once a mag [ie. every 5 shot string] the hammer fails to lock back after loading a new round. I've read the stickies and it looks like it may be a problem with the fit of my trigger group in the stock [it's currently _very_ tight].

I'll be investigating '2', but if anybody can advise me on '1', I'd sure appreciate it.

 

[CanAm]

#1 is totally normal

 

[45ACPKING]

1, Normal in most semi autos with a free floating firing pin,
2 not normal, ensure mag is seated fully.
And ensure stock is not too tight in magwell area.

 

[Sluggo_m14]

#1 can be a cause for concern, if using soft primers, or improperly seated primers.

 

[chalkriver]

#2 Do the trigger test after assembly procedure , if the hammer isnt staying back when cocking the action you may get a slam fire.

Trigger test

#### the action and engage the safety, test trigger. Release the safety and fire the action. Squeeze and hold the trigger down and then #### the action again. Keeping the trigger squeezed allow the action to go forward and watch for the hammer following the bolt.
Release the trigger and you should hear a click, squeeze the trigger and it should fire.
Repeat this a few times to ensure you don’t experience a slam fire.

 

[Tengoo]

#2 Do the trigger test after assembly procedure , if the hammer isnt staying back when cocking the action you may get a slam fire.

Uh-oh... Fails every time. Thanks for this, Chalky...I knew this test existed but hadn't yet looked it up. I see in the Sticky that you had a similar problem...I'll start working on my stock/trigger group fit [it's _very_ tight] and see how it goes.

I sure wish I had noticed this at Hungry's Clinic last Sunday...

 

[Tengoo]

Just in case anybody's keeping track... My rifle passes the trigger test every time with the original Norinco plastic stock. Fortunately my wood stock has plenty of 'meat' around the trigger guard area, so relieving it a bit shouldn't do any harm to its overall strength. Time to get out the woodworking tools...

 

[Repro77]

I just had to take off a bit of material under the very back of the trigger group. Pics are in the stickies, I think.