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Message: <blockquote data-quote="NikatKimber" data-source="post: 736326" data-attributes="member: 423">I'm not an AR expert, but if it was short stroking wouldn't the hammer fail to engage the sear and not remain cocked? Or is there a secondary notch?1) too strong of spring) Bolt goes back, not completely. Spring has stored all the energy of the recoiling bolt, and now slams it forward. The spring *should* return the bolt completely to lock up, even if it is short stroking. The issue would be if the bolt's travel was enough shorter than required the hammer would not be completely compressed into position to catch the sear.2) Too soft spring) Bolt travels completely to the rear, and is stopped before the spring can absorb all the energy, therefore the spring returns the bolt with less energy than necessary to lock up completely. Hammer is completely cocked, but the hammer falling only completes lockup as opposed to striking the primer.Now again, I'm not an AR expert AT ALL, just thinking the process through. If I'm wrong, someone correct me. And if possible, explain why, just since I like to know what's going on.</blockquote>