New 410

[neutron619]

14 hours ago, Ultrastu said:

it sounds more like a timing issue to me .ie the bolt is coming rearward too early in the whole  cycle . This is probably  caused by either a very weak spring or /and a light bolt or /and  too big a gas ports that action the bolt .

This would lead to a bolt coming back too early while there is still significant pressure  inside the case meaning the brass gets ripped off cos the plastic is still being pushed hard into the breech walls and sticking while extraction  is taking place .

I don't think your suggestion is too far from mine above re: primer popping.

I'm thinking about the separation mechanism though. Presumably you think the bolt claw is pulling the brass off the case as the bolt goes back whilst the pressure holds the plastic part in the chamber? On consideration, that seems more likely than explosive separation as I can't imagine there's much opportunity for the gas to get between the case and the brass - the primer would pop before those layers in the case separated.

One last thought I had was whether these were smooth or ridged cases (can't remember the proper name). Smooth plastic would presumably stick more from higher friction. I'd be interested to know the outcome of a comparison. Likewise, a 2½" cartridge, which presumably, being lower pressure, wouldn't stick (or be as likely to).

[ditchman]

15 hours ago, Ultrastu said:

I'm personally not too convinced by the firing pin line .it sounds more like a timing issue to me .ie the bolt is coming rearward too early in the whole  cycle . This is probably  caused by either a very weak spring or /and a light bolt or /and  too big a gas ports that action the bolt .

This would lead to a bolt coming back too early while there is still significant pressure  inside the case meaning the brass gets ripped off cos the plastic is still being pushed hard into the breech walls and sticking while extraction  is taking place .

It may not be but it seems more plausibly than the firing pin to me .

This would also explain why so far its only the semi autos having issues and not the pumpers .

i can go with that 

[Ultrastu]

The layvale case in the photo above looks like a smooth plastic case to me .

That's a good thought about a ribbed case neutron .

I guess if my suggestion  above  is the  correct  diagnosis then it would lead to a bolt coming backwards early and reducing barrel pressure as the shot goes up the bore  leading to poor velocities and excessive flash and noise from the breech .I wonder if this has been experienced .? 🤔

[Stonepark]

Sounds like the inertia spring within the bolt head is not strong enough allowing rearward movement before pressure has dropped sufficiently.

[243ack]

I've been told redesigned gas pistons are being retrofitted - when they arrive!.

[mickanles]

After testing various different brands of cartridges it seems it’s only the lylvale which fault in this gun,

Primers pushed out, heads separated from case,

Will send an email & report the findings 

[mickanles]

After suffering with constant jam ups

Gun returned to rfd & full refund given,

[Newbie to this]

1 hour ago, mickanles said:

After suffering with constant jam ups

Gun returned to rfd & full refund given,

I was told by my local RFD, that they are fussy on cartridges, mainly lengh of cartridge.

[Ultrastu]

The ones returned by gun shop back to the distributor  haven't come back in .

Clearly a big problem .

 

[mickanles]

12 hours ago, Newbie to this said:

I was told by my local RFD, that they are fussy on cartridges, mainly lengh of cartridge.

Ok if you want to shoot 2 1/2 inch 

 

[243ack]

SGC latest update: redesigned gas piston fitted - still no worky!. (How did it pass proof?????).

Now awaiting redesign of the redesign and shipping of gas piston. My customer is amazing: still wants to wait. I'm hacked off with chasing this after months.

SGC comment: you've only got one customer chasing you..................................