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Posted: 4/26/2008 5:30:09 PM EDT
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So...I purchased a new HK416 upper. I pinned it on my brand new 6920 lower. I charged the weapon with new LC M855, the round chambered...squeezed the trigger...."Click!" I attempted several times. No primer strikes at all. Check the bolt carrier group...everything seems normal. Anyone have a clue? Thanks, Maj |
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I have never fired a 416, much less taken one apart, but here are the first things that popped into my head: Does the lower work on other uppers? Does the upper work on other lowers? Is the firing pin installed correctly? Is the firing pin installed at all? Is the firing pin broken? |
It has a firing pin safety, but not sure how it works. It is designed to minimize slam-fires. Maybe there is a part of the lowers design that trips the FP safety. |
Then check. You should be able to push on the firing pin and see it pop out the front. It could be the firing pin retaining pin was put in front of the firing pin, not allowing it to push forward and out the bolt face. |
Yes sir...tried that as well. I tried checking the firing pin retaining pin as well...ensuring it was in the correct place. The firing pin barely protrudes from the face of the bolt when it is depressed fully. This is killing me. |
Crap... I read something about the hammers somewhere else the other day too. ETA: With getting back, moving, starting a new job, I haven't even had a chance to shoot the 416 upper I bought months ago. if this is a show stopper, I'm gunna be really bummed. How is it that other folks have had 416 uppers for months and never reported a problem? |
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If you are using the factory Colt trigger group, you probably have a "notched" semi-auto hammer. You need a hammer that does not have the notch. The M16 hammer, and some semi-auto hammers, have a different profile and the strike face of the hammer is taller. The notched hammer is not tall enough to correctly disengage the firing pin safety. Your other option is to remove the firing pin safety from the carrier. There was a thread about this same issue on HKpro recently. |
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Read Va_Dinger's post in this thread. hkpro.com/forum/showthread.php?t=80049&highlight=416+hammer ETA, I saw that you posted in that thread. If you already know this and already have a correct hammer, ignore my post.
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Yeah...I thought I had read somewhere that the "correct" hammer was needed to operate the firing pin trip safety. Anyone have a pic of an M16 hammer vice the notched semi-hammer? I'm betting that it's the hammer not tripping the safety. Hmmmm....both the upper and lower were NIB when I got them today. Thanks |
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You need this part. It's a Colt notchless semi hammer for .170 pins www.specializedarmament.com/products/HAMMER_HAMMER_PIN_RETAINER_ASSY_0_170_SEMI_TYPE_I_DESIGN-243-0.html You can see the different types of hammers here www.biggerhammer.net/ar15/hammers/ |
His issues have nothing to do with the carrier not being in battery, they are due to the firing pin safety in the HK416 that is not present in normal ARs. |
I forgot that they had that FPS. You need a longer hammer to lift it up to strike the FP. Thanks for the info. |
Yep, he needs the one I linked to from SAW. $50 might be expensive for a hammer, but it's peanuts compared to a 416 upper! |
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Good news to hear on the hammers being an easily fixed problem. I just checked the two LMT's and the CMT parts kit I've got on hand with me, all have the correct height, notchless hammer. Sounds like it's kinda hit or miss with what hammer you get from some vendors based on what they have on hand when. |
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