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Thanks. I have shot quite a few rounds since the modification without any problems.

I did some more modifications as follows and it seems to function OK now. As I could not drill the receiver dovetail I modified the Bolt Stop Bracket to accept a small spring. A slight offset prevented the spring from hanging up on the frame as can be seen in the photos. http://i160.photobucket.com/...

Received and installed the parts in the modified receiver and frame assembly. The upgrade works great. I am still having a little problem in finding a good bolt stop bracket spring setup.

Bullseye wrote: Milling a bolt stop slot is essential. Bullseye

Bullseye...Thanks again for update. I do have a small verticial mill so this is not a problem.

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Bob

Thanks for the info.......I do have a A-100 frame so I will order the parts and give it a try and post the results when complete.

Has anyone tried to rethrofit a Mark II Stop Bolt bracket and a Bolt Release bracket in a Mark I frame? It looks like minor modification to the frame may be possible.

Thanks.......I will give that a try.

Is there a way to modify a Mark I magazine to load 10 rounds? Will a Mark II magazine fit?

I have an older Mark I target pistol and I would like to know if the Mark II or III sears will fit.