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I'm building a .223 AK from a Bulgarian AK-74 parts kit very soon, so I've been checking and comparing the Saiga and AK-74 parts in order to make sure that they can share all mags I have on hand without issue. What I've found is that there are two trunnion dimension types that the majority of .223 AK mags are designed for: AKM and AK-74. The AK-74 trunnion has smaller height locking lugs. The AKM trunnion locking lugs have a greater overall height, and protrude lower into the magazine well. The Saiga .223, despite being based on the AK-100 series, uses a trunnion that shares locking lu