PP700S-A Pistol, guided breech block

So I've made a few of these guided breech blocks for the .177 and .22. 
In the open position the block has a groove in it to guide the pellet into place.
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I have integrated adjustable stops on both the open and closed positions for that perfect alignment. 
They are aircraft Aluminum and anodized black. 
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Here's my .177 and .22, the .177 is the Artemis PP700S-A and the .22 is Mrodair's Precision pistol. Fits both perfectly. 
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I made a dozen prototypes, 6 of each. Figure some of you US based folks would like to test one.
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Contact me via PM for more info.