The Troy/Samson product cost a bit more than the MI because of additional machining.
The machining is a bit more intricate, allowing the product to be lighter.
The bottom rail on the MI simply bolts to the top. The Troy/Samson models have sliding tongue and groove type locking mechanism.
The overall quality of machining is excellent on all the brands listed (MI, Troy, Samson).
Lots of good info Metroplex.
The only thing I would want to point out is this:
Quoted: Note that the Midwest relies on steel pins that locate on the notches of your stock barrel nut. These steel pins are found in aluminum locking plates. I would imagine with enough torque and vibration, the steel pins may bend/distort/wear at the aluminum plates and cause some minor play over a long period of time.
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If the free float is properly installed, the pins in the MI will not experience any torque etc. They are simply there as “insurance”. The first prototypes did not include pins and did not need pins. They were added so that if the barrel nut clamp was not properly installed and became loose the pins would hit the teeth of the OEM barrel nut and stop the handguards from doing a 360.