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I have tp555's on-off on my 223 and three way on my 300-221 uppers.
The on-off block is awesome. You don't realize just how loud the action is until you completely banish that noise. Felt recoil also seems to go down, but video shows the same exact amount of recoil.
My on-off got shaved down a tiny bit to fit in the standard position on the 223. The 300-221 just barely fit under a 1.75" ID hand guard. Things to keep in mind. My 223 has a 1" barrel to the block and then 0.930 the rest of the way. The 300-221 is 1" to the block (in the pistol position) and then 0.750" the rest of the way. I have a standard length hand guard on both.
If you want the block under the hand guard, you probably need either to go with only a 0.750" barrel or find a larger than 1.750" ID hand guard.
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