Put together a new lower and thought some might be interested in the Fortis end plate / castle nut. Fortis says the goal was to have a lightweight but strong end plate and castle nut combo that would making staking unnecessary, while improving on ratcheting solutions like PWS.

Here it is:
https://fortismfg.com/endplate-castlenut-k1

Details in the lower:
- Aero M4E1 receiver
- Sionics ambi LPK
- Sionics (Schmid/1005) 2-stage trigger
- Troy ambi mag catch
- BCM pistol grip and gunfighter stock
- BCM A5/intermediate receiver extension and A5H2 buffer
- Fortis LE end plate K1 castle nut
- Springco green rifle spring


I like the look of the Fortis after installed, and it was fairly slick and easy to get on. I used my castle nut tool to tighten about 1/4 turn beyond hand tight. Wouldn't say this is necessary versus staking, and adds some cost, so definitely not for everybody. But it seemed like an elegant solution, easy to install, strong and nicely finished, and locks up really tight. I wanted to try one out on one rifle. Will update if I see any issues like working its way loose.

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