Remove triangle sight pins and screw?

[SuperCriollo]

Al right guys, I've been trying to remove the triangle sight pins and screw of my VFC M4, but they are extremely tight. No matter how much force I apply, they wont move. Any tips ?

Thanks.

[Stealth]

Are they rollpins or straight pins? If they're rollpins, you'll need a rollpin punch or something that's JUST the right size. Hammering it out with a slightly undersize will flare the pin and make it impossible to take out.

I would remove the small grub screw on the bottom first to relieve pressure off the pins, then use the appropriate punch to take them out. Do NOT strip the grub screw or you're hosed.

[SuperCriollo]

Than, I will try to find a punch of the perfect size. The problem is that the screw is extremely tight as well, and since the allen key is so skinny, it will just bend. I've been thinking about applying heat, as the barrel and the sight are aluminium, they will expand faster than the steel pins and screws, making it easier to remove them. Or thats my hypothesis.

[L473ncy]

Are you sure they're roll pins? Aren't front post pins usually tapered steel pins?

It might be a lot easier if you have a front sight block bench like this: http://www.brownells.com/gunsmith-to...prod20727.aspx

[m102404]

Support the front sight with some blocks of wood while you're hammering on it...it'll help keep thing in place.

Roll pins or straight pins, I've seen both...either way find a straight punch that fits. As big as possible while still fitting the cross-pin holes. If you don't have one...an allen key will do most times, again...as large as possible. Over the years I've cut the long leg off of several allen keys to end up with punches of various sizes.

With roll pins...you can knock them out either way. With tapered straight pins (some are tapered...some are basically straight with a knurled end) you'll have to see which side to knock them out. Take a very close look and sometimes you can see that one end is knurled.

With the set screw...use an allen key that fits. Tighter is better. If you need to heat up the set screw to break any threadloc that might be in there...most times it's just jammed because of the finish and heating it up will soften it a bit. I'd use just a bit of heat from a propane torch.

If you round out a jammed allen screw of that size...you might be best off to drill it out and then retap it for a larger set screw.

[SuperCriollo]

Thanks, managed to move those fucker with a broken allen key, and lots of TLC. The screw is still stuck though... sigh

[MaybeStopCalling]

If you haven't rounded it out completely, a 1.5 mm allen key should save the day, else you are screwed (no pun intended)

[SuperCriollo]

Ok , FINALLY managed to remove my front sight, thanks to everyone.
However, replacing the outer barrel is gonna be a real challenge as my gun has a Noveske rail installed from factory, and it seems you need a special tool to remove the nut, which of course I don't have