Browning Buckmark

mlsieczko · January 13, 2008, 09:33 AM

Could anyone please tell me if the mounting screw on my "Standard" front sight is ASE or metric? If it is metric, what size is it? I'm trying to install Hi-Viz sites and have managed to strip out the hex head. I now need to replace it but have no idea what size it is. Any help would be greatly appreciated.

Thanks in advance,

Michael

Scorch · January 13, 2008, 01:49 PM

Go visit a gunsmith for the right thread pitch screw. It is neither USF or metric, it is a special thread pitch used in firearms.

mlsieczko · January 14, 2008, 02:48 PM

I was able to take it to the machine shop we have at work and they informed me it is a 5-40 thread. You're absolutly correct....that is a strange size. All i have to do not is find a 5-40 bottoming tap!!!!

Thanks for the help.

M

Scorch · January 14, 2008, 02:53 PM

Again, any gunsmith should have exactly what you are looking for, or you can buy the tools and screws direct from Brownell's or Midway.

mlsieczko · January 14, 2008, 06:39 PM

Luckily I was able to pick up the proper tap at a local distributor. With a # 39 drill I was able to remove most of the broken screw and chase the remaining threads with the 5-40 bottoming tap. After shortining the mounting screw and using a drop or two of loctite the sight mounted perfectly. The reason I'm going thru all this instead of using a smitty is because he's 45 miles away and I need to shoot tomorrow, we have a improptu club that shoots every Tuesday and I don't want to miss the fun.

M

Scorch · January 15, 2008, 02:11 AM

Gotcha. You can buy assortments of gunscrews in a little compartmented box from either Midway or Brownells. It's a good thing to keep around.

January 13, 2008, 09:33 AM	#1
mlsieczko Junior Member Join Date: January 13, 2008 Posts: 3	Browning Buckmark Could anyone please tell me if the mounting screw on my "Standard" front sight is ASE or metric? If it is metric, what size is it? I'm trying to install Hi-Viz sites and have managed to strip out the hex head. I now need to replace it but have no idea what size it is. Any help would be greatly appreciated. Thanks in advance, Michael

January 13, 2008, 01:49 PM	#2
Scorch Senior Member Join Date: February 13, 2006 Location: Washington state Posts: 15,248	Go visit a gunsmith for the right thread pitch screw. It is neither USF or metric, it is a special thread pitch used in firearms. __________________ Never try to educate someone who resists knowledge at all costs. But what do I know? Summit Arms Services

January 14, 2008, 02:53 PM	#4
Scorch Senior Member Join Date: February 13, 2006 Location: Washington state Posts: 15,248	Again, any gunsmith should have exactly what you are looking for, or you can buy the tools and screws direct from Brownell's or Midway. __________________ Never try to educate someone who resists knowledge at all costs. But what do I know? Summit Arms Services

January 15, 2008, 02:11 AM	#6
Scorch Senior Member Join Date: February 13, 2006 Location: Washington state Posts: 15,248	Gotcha. You can buy assortments of gunscrews in a little compartmented box from either Midway or Brownells. It's a good thing to keep around. __________________ Never try to educate someone who resists knowledge at all costs. But what do I know? Summit Arms Services

January 14, 2008, 02:48 PM	#3
mlsieczko Junior Member Join Date: January 13, 2008 Posts: 3	I was able to take it to the machine shop we have at work and they informed me it is a 5-40 thread. You're absolutly correct....that is a strange size. All i have to do not is find a 5-40 bottoming tap!!!! Thanks for the help. M

January 14, 2008, 06:39 PM	#5
mlsieczko Junior Member Join Date: January 13, 2008 Posts: 3	Luckily I was able to pick up the proper tap at a local distributor. With a # 39 drill I was able to remove most of the broken screw and chase the remaining threads with the 5-40 bottoming tap. After shortining the mounting screw and using a drop or two of loctite the sight mounted perfectly. The reason I'm going thru all this instead of using a smitty is because he's 45 miles away and I need to shoot tomorrow, we have a improptu club that shoots every Tuesday and I don't want to miss the fun. M