The type 1 was the original FAL lower receiver, cut to be as lightweight as possible
Type 2's have a little bit of a different cut which was supposed to help the receiver stay together near the end of its life (like the M16A2's lower rear reinforcement vs the M16A1's). I've never seen any evidence to indicate this helped. The rifles will last 20,000+ rounds, which you will never reach, mainly because in todays market that would be nearly $10,000 worth of ammunition. The turkish G1 kits still had plenty of life left in them, and they rode those like cheap whores.
Finally the Type 3 was produced to save on costs, it has practically no lightening cuts anywhere. The last type 3's made where cast, which were no less durable.
Unless you are building an FAL with a type 2 or type 3 kit, I would just get the DSA type 1. It's lighter. If you have a type 2 or 3 kit the lower receivers match the upper receivers in lightening cuts (or lack there of).
The aluminum lowers are way lighter too. Over half a pound, maybe nearly a pound.
"Life is short, but the years are long." - Robert A. Heinlein
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