Chamber Reamer＋Combo Rifling buttons (Chamber Reamer＋Combo Rifling button9x19Luger 6/6gr)

The parts ordered are exactly what we needed/wanted/ordered. Quality workmanship. Items arrived within the timeframe promised. Very pleased. Highly recommend this vendor's products. Was a pleasure to work with.

They produces are made from very good steel and will last a long time. Their rifling buttons are very well made and easy to press through without any chattering. The reamer is very good steel and will stay sharp for a very long time. Their customer support is top notch and is always quick to respond and answer any questions you have. 10/10 will buy from again if I need other calibers.

This is the 2nd time I have bought a Hammerbutton rifling/reamer combo and this is the 2nd time I have deeply appreciated the products that they produce. Do yourself a favor and use Hammerbutton. 4140 steel and .380 auto.

This started with a .22 LR Stevens favorite with a bore eaten out by corrosive ammo. I also wanted a reload-able alternative to .22 LR, which is getting hard to buy with the COVID panic. I decided on a rebore, rerifle, and firing pin conversion to make a 25 ACP "Mouse Gun". I bought a 25 ACP button from this vendor on another site. The button is nicely machined and finished. Absolutely no instructions on using this item. I emailed them asking what lubricant to use, since that is a source of problems: rough finish and sticking of the button in the barrel. They recommended graphite or Molybdenum Di-sulfide. Users of buttons had problems with both. Graphite and Molybdenum are good high pressure lubes. They don't do well at the extreme pressure of button rifling. Information is hard to find. I finally came across the site of the BALTEC company that sells precision hard steel balls for bore finishing (Ballizing). The Ballizing process is very similar to button rifling in that a hard steel ball a couple of thousands over drilled size is pushed through a rough bore to achieve a precision diameter and a mirror-like finish. They sell a lubricant called SAPPHIRE OIL for this purpose, that is a triply chlorinated honey oil similar to those used for industrial steel wire drawing and metal forming. Baltec sells a pint of SAPPHIRE OIL for around $20 with shipping. Balls are very in price but are around $17. I bought Sapphire oil and bore sized balls from them. In the process of ballizing the rebored Stevens Favorite .22 barrel, I learned about pusher pins. The button vendor does not sell pusher pins. Those sold by other vendors are too small in diameter for the .243 25 ACP bore. I tried pushing a ball down the bore with too small pins. That resulted in bending pins and a one case the drive pin shattered and shot out shrapnel. It worked-- barely and DANGEROUSLY. Needed larger pins! The SAPPHIRE OIL worked nicely. No sticking, smooth finish. no scoring of the ball. I found Toolmart 6 MM ejector pins on Amazon that are used for injection molding. These are hardened steel 6MM (.236") diameter and 100 mm long with mushroom heads. The shaft of these pins is .007 under .243 bore size and are perfect for this caliber. I used an abrasive cut off disk in a Dremel tool to cut the pins to size, and left the mushroom dead on the one I used for a driver. You stack the pins as you go, doing about 1.5 inches per stroke of the press. Never leave more than 1.5 inches of the outside pin unsupported while pushing. This prevents flexing and bending. I built a false muzzle extension to support the drive pin outside the muzzle. The ejector pins come in other sizes that will work for other calibers. Using lessons learned during ballizing, I used Sapphire OIL lube, 6 mm ejector pins, and my 12 ton hydraulic press to push the rifling button. It went well. It took a lot less force than I thought it would. The rifling grooves and lands were smooth and shiny . The vendor would do well to buy a pint of SAPPHIRE oil and include an small vial of it with each button sold. You only need a few drops. A set of correct sized pusher pins would be a good companion product. I put the barrel on the Stevens Favorite converted to center fire and shot 0.65" 25 yard 5 shot groups off hand. Not bad for an amateur rifler's first try. Good extreme pressure lubricant, right sized push rods and a hydraulic press are necessary to succeed in using these buttons.

I bought the reamer and rifling button sets and the reamers were good and sharp. Very well made and cut my chamber nicely. I haven't used the rifling button as I already had the barrel blanks available. Definitely worth it just for the reamer.