When it comes to precision engineering and machining trust me cheap is cheap which ever way you want to take it
Look at Davis and detlef sights made by people with limited overheads and yet you pay nearly as much as a
sureloc even the omega sight merkin used to make cost more and again lower overheads
But if money is tight then it will do you but do not expect to get a cheap
sureloc
Alternative look on eBay for a second hand sureloc, toxinics or
shibuya
Courtesy of iMoose