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Any idea where I get one from? How will that change the spring pressure in the mag?

Yes bolt locks back on empty mag. The mags are one nylon 7 round of unknown origan and three of the latest generation spear 7 shot mags. Problaem seems to happen more on first shot than last shot...

I have an AR question. I fitted an adjustable gas block to my bang stick. I wound it down to the most restrictive setting, it still cycled with the suppressor on so job done.

Post that I have...

50fps per inch is the general rule.

Any opinions or recommendations on adjustable gas blocks?

This one is cheap
AXC 223 5 56 Aluminum Low Profile Micro Gas Block 750 w Free Carbine Gas Tube | eBay

Steel or aluminum?
Set screws...

You don't sound that happy Happy.