Fun shop project, GP100 underlug cutaway.

[CougarMtn]

I Sure like the balance and looks of the Ruger GP100 Match Champion. A bit out of my budget, and already have a 4" standard model. Not a big fan of the full underlug however.

Since it's a shooter, not collectable, decided to modify the one I have. Cuts were made using a brass mandrel, centered on the bore, with the milling machine. All said and done, shed 1.3 ounces (approx 3 loaded cartridges). Overall, feels more balanced. Has anyone else done this modification?

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[Bill Siegle]

Nice! DIY Match Champion mod! I much prefer the weight and feel of my MC to the standard GP100. Looks great!

 

[Nosferatu]

Nice! DIY Match Champion mod! I much prefer the weight and feel of my MC to the standard GP100. Looks great!

Nicely done. No, I haven't done the modification since my GP100 Match Champion 10mm came from the factory Match Championized.

20221019_140706.jpg

• Nosferatu
• Oct 19, 2022

Ruger GP100 Match Champion 10mm.

 

[Stomper]

I Sure like the balance and looks of the Ruger GP100 Match Champion. A bit out of my budget, and already have a 4" standard model. Not a big fan of the full underlug however.

Since it's a shooter, not collectable, decided to modify the one I have. Cuts were made using a brass mandrel, centered on the bore, with the milling machine. All said and done, shed 1.3 ounces (approx 3 loaded cartridges). Overall, feels more balanced. Has anyone else done this modification?

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Although I've always preferred the "look" of full lug GP revolvers, that's a nice and smooth looking piece of work you did there!

 

[Jay Walk]

Sweet Mod, thank you for sharing.

 

[Alexx1401]

Nice work! Came out great!

 

[MikeInOr]

I Sure like the balance and looks of the Ruger GP100 Match Champion. A bit out of my budget, and already have a 4" standard model. Not a big fan of the full underlug however.

Since it's a shooter, not collectable, decided to modify the one I have. Cuts were made using a brass mandrel, centered on the bore, with the milling machine. All said and done, shed 1.3 ounces (approx 3 loaded cartridges). Overall, feels more balanced. Has anyone else done this modification?

View attachment 2033381 View attachment 2033383 View attachment 2033390

Looks great! Could you give a little more detail on how you milled off the underlug? Do you have any pictures of the process?



Full underlugs makes sense for my 8" and 10" barrels. I would like to take off the extra weight for the 6" and 4" barrels. I also like the look of only partial underlugs for these barrel shrouds. I do have a knee mill and a SB 13" lathe.

 

[CougarMtn]

Mike,
Your project would be easier, as the barrels are removed. I supported the barrel with the brass mandrel, in my mill vise on a thick parallel. Rotated the barrel mandrel assy a couple of degrees after each cut, creating small facets that were easy to file and sand smooth. Ball endmill to finish the remaining underlug. Btw, I rough machined the cutaway first, before mounting on mandrel. The entire project, including making the mandrel, took about half a day.

 

[Knobgoblin]

That's slick.

You looking for a grip upgrade next?

 

[CougarMtn]

Next upgrade, spring and shim kit. Should be here next week. DA trigger needs some help.

 

[arakboss]

Next upgrade, spring and shim kit. Should be here next week. DA trigger needs some help.

Very nice.

 

[VinnieBoomBah]

Has anyone else done this modification?