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So are you going to pin the stock so it can't telescope? Otherwise, under current California law, you would be manufacturing and possessing an unregistered assault weapon by having a semi auto shotgun with a pistol grip and telescoping stock.

Glad you got it apart. Someone added that screw which is why it’s standard thread where as the Benelli is all metric. It’s weird that they added that screw to an M4 with a neutered receiver extension. X Unless you’re in law enforcement I don’t think there is a civilian exemption. Now, if I understand California rules, you could put the 3 position extension on and use that screw to lock the stock in to the position you want.

No, there is no provision for registering or exemptions. Once that section of the penal code went into effect 1/1/2000, that's it. Tax stamp and 922R are federal regs., not state. Even though that stock as you purchased it does not have the capacity to telescope, I'm surprised that it was sold in Ca.. It's the first Iv'e ever heard of. Maybe it's a recent addition of Ca. available M4's since it's unable to scope in and out. Has the "look" but doesn't work. Yeah, the only other legal options for a Ca. resident are the straight or "field stock" or, the more commonly found non collapsable pistol grip stock. Better you found out now before you spent $$$$.

You're absolutely mistaken. See here statute 12276.1 item 6 A&B. https://oag.ca.gov/firearms/regs/genchar2 A semi auto shotgun that has both features of a pistol grip AND telescoping stock is an assault weapon. You don't want to go there.

Third picture down shows a silver thing sticking up under the cheek riser, I can’t tell if it is a pin or screw or just a light artifact. Either way there should be nothing there.

Thanks for the pics. I’m driving home at the moment so my replies might be slow. That pin under the cheek piece is normal. I’d remove the cheek piece by the three top screws, then slightly press on the button while tapping the pin out that is under the cheek piece you mentioned. This will allow you to remove the button. I assume someone inserted something beneath the button to prevent it from being pressed. The only thing under the button should be a greasy spring.

That’s weird. It should depress about 3/5 of an inch. Take a picture of the assembly and of the existing receiver extension. There are ways to pin the stock button that aren’t obvious. Basically something is inserted beneath the button to prevent it from depressing.

Are you asking how to remove the stock from the recoil tube? For that, press the unlock button, rotate the stock 45 degrees to the ejection port side. Slide the stock forward, the rotate the stock 90 degrees to the left side, then slide the stock off the end of the recoil tube.

Rex - Are you in California? The recoil tube is all that is needed to make your collapsible stock functional. The trouble is they’re a PITA to remove and replace. You need a Mapp torch to break down the factory threadlocker. I have a tutorial thread on here somewhere showing what’s involved to do the job.

Just checked FFT. Yep, they’re selling them and they have a better picture of the tube. Those notches definitely won’t fit the M4 collapsible stock.

Yep. No issues at all or performance changes that I’ve noted. Just one less part that can rust and bind up. I recommend getting one of those Briley choke wrenches. I’ve never had a choke loosen up on me since I began using that tool.