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I have done all the upgrades to the Mk lll except the slingshot. Today I removed the spring and detent ball and assembled the gun. I put in an empty mag and pulled the bolt back but it wouldn't pull out partially, just all the way back and locked. Am I missing something here?
I do have a PAC-Lite barrel/receiver but didn't think that would affect it.
Maybe something could help me see what I'm doing wrong.
I thought with the empty mag in it would simulate the last round being fired.

A empty mag is suppose to lock the bolt back.

Did you test with a loaded mag in the gun?

If the bolt only cam back about 3/4 and hung would indicate the hammer strut is not in the main spring housing correct, missed the pocket.

Thanks Blue;
My goof-I was testing without ammo in mag.
Slingshot method works perfect.

Please don't test your bolt's slingshot mod using live ammo in the mag unless you're at a firing range. You can test this function feature without a magazine installed. That way the follower button will not uplift the bolt stop and catch the bolt in its rearward most position.

R,
Bullseye