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Help Needed Installing HK416 / MR556 safety selector

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5.6K views 11 replies 9 participants last post by  Rollerlock9  
#1 ·
Any tips on how to install these selectors? I've built ARs before with no issues, but these little pins for the selectors are being troublesome. I already bent one a little bit, hoping it's salvagable. Is there some specific way of doing this?

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#2 ·
Here’s how I do it.
Install the safety axle on the receiver as normal. Once it’s installed completely I.e plunger and sling followed by grip and bolt. Then flip it into safe, put the lever on the axle and add 1 drop of lube into the hole. Using a 1/16” roll pin punch I push into the hole to ensure that everything is lined and lubed up. Then I place my pin in and I start tapping it into place. I do NOT use those starter roll pin punches I just go at it soft, but firm with a heavy hammer and it gets the job done easy.
 
#4 ·
Thanks for the responses.

I was hoping I could get one of the levers on before putting it into the receiver. I oiled the pins as well with no luck. Currently, I'm freezing the pins and will give it another go later.

@Sextus How are you tapping the pins in without a roll pin punch with the selector in the receiver? I'd imagine it's awfully close and you risk striking the receiver pretty easily. Just being real careful?
 
#6 ·
It has been several years since I messed with one. I recall putting one of the selectors on the axle, and then putting that into the receiver. I started the roll pin the remaining selector, put it on the axle, and then tapped it in with a punch and hammer. If you are worried about your receiver getting scratched then just cover the respective areas with electrical tape.