Reddit reviews Bosch CO2137 5/32 In. x 3-1/8 In. Cobalt Drill Bit
We found 1 Reddit comments about Bosch CO2137 5/32 In. x 3-1/8 In. Cobalt Drill Bit. Here are the top ones, ranked by their Reddit score.
Withstands high-temperature applications for extended periods of time (up to 1,100 degreeF)Rigid, thick web design adds stability to bit in tough applicationsSurface hardened to penetrate tough abrasive materialsAvailable in jobber length, full shankBest used for drilling into light-gauge metal, high-carbon steel, aluminum and ally steel, cast iron, stainless steel and titanium
I've done it on my first three builds myself and it's extremely simple. Using a gas block jig from SLR + 5/32 drill bit from amazon it only took a few minutes for each barrel.
Here is a video showing the whole process using the SLR jig.
https://www.youtube.com/watch?v=41EiJvu6SAM
In short get the right size jig for your barrel, find out the distance between your set screws (.400 or .450 you can eyeball this by putting it next to your gas block screw holes), slide it over the barrel and put the set screw into the gas port, put the drill guide screw into the bottom and drill a small dimple (just enough for the set screw head to sit in), repeat on the other hole if you want two dimples.
It's very easy but that being said it cost around $35 for a jig and bit. I had to do three barrels so it saved me some money over the local gunsmiths who want $25 for each barrel.
Jigs are here for $30 a piece.
http://slrrifleworks.com/index.php?route=product/category&path=57_129
Here is the bit I used for just over $2 if bought as an add-on item or $5 by itself.
https://www.amazon.com/gp/product/B000AESUDU/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=ATVPDKIKX0DER