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I knew that the trigger/hammer internals for the MR556 were different, but I was somewhat surprised at what I found. For those that don't know, the trigger itself is in 2 parts and it lacks the traditional style trigger spring. Instead, it uses a smaller coil like that of the disconnector spring:
NOTE: The HK is on the right
I'm assuming all of these differences have to do with the ability to engage the safety with the hammer down feature of the MR556. If so, why did HK go through all this trouble for this non-traditional feature when the HK 416 uses traditional internal parts?
HK 416 Lower Parts Kit - HKPARTS.NET
On a related note, I installed one of the new ALG triggers and I am pleased as it delivered what it promises.
NOTE: The HK is on the right

I'm assuming all of these differences have to do with the ability to engage the safety with the hammer down feature of the MR556. If so, why did HK go through all this trouble for this non-traditional feature when the HK 416 uses traditional internal parts?
HK 416 Lower Parts Kit - HKPARTS.NET
On a related note, I installed one of the new ALG triggers and I am pleased as it delivered what it promises.