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Almost done. Just waiting on RXarms recoil tube & a JW BROS for the SRO & i think shes in her final form 🤔 Lemme see your M4s! https://singuardsolutions.com/

I will be offering a drop in pinning kit for C-stocks for us here in Cali on my website soon. It will allow you to adjust the stock to the mid position, tighten a set screw down and lock it in

You can always run your M4 without the retaining spring and use the cap as the spring retainer. It will give you a bit more capacity.

I've had to fit many of those FFT trigger kits in recent years for hanging on the disconnector. I found the best option was to use a small file and to remove material from the hammer sear until the trigger disconnects properly. I like to do the work when the hammer is installed so I can quickly check my work. If you haven't done so already, set the spring retainer in the end of the magazine cap so it sticks out past the end of the magazine tube. As you install the magazine cap, you'll feel it press the retainer into the depth it needs. Setting the retainer in too deep can limit the room you have for shells. There are a lot of 2 3/4 shells that don't conform to the size standards. Stacking up 7 of them ends being slightly longer and prevents the 7th round from fitting.

You don't need to press the shell drop lever. The shotgun will load from the magazine tube on its own.