Lever Hitting Upper Receiver

incoGnito12

DNT SS runs like a sowing machine with the A5 buffer system, but after about 200 rds ran through it, I noticed the lever showing some wear on the bottom side at the bend where I assumed it was touching the upper receiver during cycling (this was confirmed after looking at the inside of the upper receiver near the back pin hole and indeed seeing paint being removed from the suspected area. Slight paint removal on top of the lever but nothing worth even sanding as I figured this was normal sliding against the bolt carrier.

Again, not having any issue whatsoever, yet, but with knowing it’s in fact making contact, would the correct way to prevent this contact to be filing down the under side of the lever at the bend, or to dremel/file out material on the upper receiver? Theoretically, I would think the upper receiver as taking material off the lever would in turn make it weaker/thinner. Saw on another post HoffmanTactical commented that removing material from the upper receiver is NOT the way to go. Looking for possibly an explanation on this, or if it’s nothing I should be worried about since it’s running great.

Hope yall can help!
Thanks

undeadchew

incoGnito12 Hi, from my understanding and in practice what I do with every metal SS I have acquired is to file, polish and oil the surface of the lever that contacts the BCG. Shown in green in my picture below.

The reason why I modify the super safety is for a few reasons firstly because it's the cheapest part to replace, second I have to remove the least amount of material, third is if I modify the upper receiver I could make it incompatible with the super safety and have to purchase a new one. (Also I've done this procedure several times with success) Finally it makes the super safety more likely to be a drop in replacement part after tuning, where I can move it to another frame without having to make the modifications again.

incoGnito12

undeadchew okay, I’m halfway understanding. Sand/polish top of lever as needed and keep oil on it. So don’t worry about the under/bottom side that’s touching the upper receiver? Or did you mean file/sand/oil the underside as needed also?

If it is required to touch it at some point to keep the lever in place for the BCG to bring it back forward, I would assume taking too much of the receiver would, as you described, cause the gun to not function as the lever would rotate too far when going back. If this is the case it would just be a matter of how hard the lever is hitting the upper when it comes back.

undeadchew

incoGnito12 Yes I would only address the top of the lever, and leave everything else the same. We don't want the lever to potentially get stuck under the BCG. Contact with the upper receiver's bottom lip or "shelf" is normal so I expect you will see normal wear in that area. My concern when tuning was to prevent bolt binding, reducing friction/stress that could cause the lever to crack. My theory was that the BCG was pinching the lever against the upper receiver.

incoGnito12

undeadchew got ittt. I can see that now. Taking material off (not too much) the top of the lever will leave less to contact the BCG, sending it back with less force and causing it not to hit the shelf as hard. I appreciate it!