Master Lock 930

Difficulty Notes

The lock is described as 'not the easiest thing to pick' and having 'heavy spring tension.' One user noted being humbled by the 'puny looking plastic body' 410 LOTO core after initially thinking they were a 'phenom' for picking a 930. Another user mentions having 'super tight pins' in some Masters.

Sources (r/lockpicking):
- u/MrPickur (6pts): 'Those definitely aren't the easiest thing to pick.'
- u/Mundane__Detail (3pts): '...the puny looking plastic body 410 LOTO humbled me real fast lol.'
- u/BravoLimaDelta (1pts): '...super tight pins in a couple of Master'
[confidence: medium]

Picking Notes

Users report that applying light tension may fail to rotate the core; shifting the lock in the hand while maintaining tension allows the weight of the tension wrench to rotate the core. Some users note that the lock can be picked to a false set that is actually the correct set due to high shackle spring tension.

Sources (r/lockpicking):
- u/Kitteh_of_Dovrefjel (3pts): 'I pulled the pick out and shifted the lock in my hand a bit to look down the keyway and the weight of the tension wrench was enough to rotate the core.'
- u/cheebalibra (3pts): 'Sometimes you can pick the core to what seems like a false set but it's actually picked and you just need...'
[confidence: medium]

Tension Tips

Apply heavy spring tension. If light tension fails, shift the lock in your hand so the weight of the tension wrench helps rotate the core.

Sources (r/lockpicking):
- u/MrPickur (4pts): 'I put a loto core inside a master 930 and it's a beast of a pick now [implied heavy tension context from other comments].'
- u/Kitteh_of_Dovrefjel (3pts): 'Learning to pick and control applied tension...'
[confidence: medium]

Bitting Variance

The Master Lock 930 (and related 931/911/American 700 series) features a removable core that can be swapped into other bodies (like the Magnum 930 or 410) to create a lock with heavier spring tension for practice. The core is often standard-pinned (4-tumbler), but users mention finding versions with LOTO cores (6 security pins) or Pro Series cores. The plastic body is noted for having very low tolerances compared to the core.

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