These kits are great for repairing any Alloy or Cast receivers, these kits are supplied with full instructions and braze rods, flux, and actuation tool for spreading the heat and braze,
the best thing about these kits you only need a common house hold blowlamp or heat torch,
it takes a little practice to use these kits on some scrap alloy to master the technique but the end results are good. and then can be re-drilled/tapped, filed or shaped. so if you are building an 80% receiver and made some mistakes or just want to repair a hole thats worn too big, threads that are stripped or even small cracks in alloy, these kits are worth a try before you scrap the part.
The only thing is i'm in the UK so if anyone is interested send me a IM or post here and i'll send the link to my ebay listings.
5 kits available, may be able to get more if interested.
Price $18.00 + $7.00 Shipping from the UK 5-7 day service.