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At $50 they sell at $95 they gather dust.
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I concur with this statement!
Used quality A2 Carry handles range from $30-70 depending on condition, manufacturer and how many the seller has on the EE. Cheapo Chinese junk A2 carry handles can be had for under 20 bucks on Amazon.
I bought one of CNC Warrior's for $65 shipped on EE and sold a Colt A2 for the same that was in very nice condition. Other than aesthetics and slight weight savings, the only advantage for the A1 carry handle is more windage adjustment and that it doesn't adjust accidentally quite as easily. This isn't going to transcend your product into a large market that the A2 doesn't already have covered.
My recommendation is to potentially have lower profile mounting nuts instead of the large knobs we see on A2's. The new CNC warrior come with flat key types. Since you are doing your own design, maybe have flat threaded inserts that lock the long part onto the picatinny upper internally instead of externally. This would save weight and be less prone to getting in my way! The only issue is it will require a real screwdriver to remove instead of a coin or flat piece of metal - not a quick detach, but a nice aesthetic option in a world with few A1 receiver options that are cheap.
If you can purchase a stripped or complete flattop upper for $40 and pay $50-60 for an A1 carry handle to have a faux A1 when used A1's are running $85-$200, you are in the ballpark in my opinion. The stripped Fulton is the only A1 that I see commercially in stock at $150.
Advice contained in this post is worth exactly what you paid for it!