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AR15.COM
9/8/2025 4:45:32 PM EDT
I have a ddm4 v7 pro in gun metal grey. Quite often when I am shooting at distance and squeezing off rounds slowly I experience double taps which I understand is due to being such a light trigger pull at roughly 2-2.5 pounds. Sometimes I get 2 shots but others the 2nd one loads and I assume I am getting a light primer strike as I will pull the trigger to fire again and the firing pin has already dropped. When I eject the round the primers are struck, sometimes looking like a good strike but others definitely light. This has happened on all ammo, suppressed, unsuppressed, with other shooters, but like I said, only happens on an accidental double tap. If I load the round a 2nd time it has never failed to go bang.  Does this sound like a hammer spring issue? Would swapping the trigger spring possibly solve the issue? Sorry if this is the wrong forum to post this in.

Thanks in advance.
9/8/2025 6:47:07 PM EDT
[#1]
Are you sure the light primer strikes aren't just from the free floating firing pin?
If you chamber a round, take it back out and look at the primer.
There will be a tiny mark from the firing pin on it.
9/8/2025 6:54:07 PM EDT
[#2]
If you are bump firing the rifle before the bolt has closed, your hammer will follow the carrier down and normally won't ignite the primer.

I would swap triggers to something with more reset distance so you are less likely to bump fire it accidentally.

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