About 2 years ago, I saw a Couger build on a FB gunsmithing group which was pretty darned tasty. Seeing that reminded me when I was a youngster about 3 or so decades ago and seeing this strange hybrid beast (a Colt Python barrel on a Ruger Security-Six frame) in a magazine - so I googled around and on eBay (of all places!) found and snagged a brand-new 4" Colt Python barrel (new old stock from the Colt factory sold at auction).
It arrived promptly and I then found a donor Security-Six with a bulged barrel - perfect.
I sent the parts to Alex Hamilton in San Antonio (Ten Ring Precision) for the build which took a few weeks and I got this back:
The DA trigger is typical Ruger - the weight is all over the place during the pull - but SA is 4lbs exactly and almost perfectly crisp (I can feel a tiny *snick* feeling just before it fires, so I can actually "stage" it). The barrel stays where it should and the revolver shoots tiny groups at 7 yards. Yep, I'm happy - good-to-go.
I bought the Dec 1979 Guns magazine (which first brought the Couger to the world), took photos and made a PDF:
https://www.dropbox.com/s/fu0y8b0s5q...ouger.pdf?dl=0
Oh yeah, costs:
Ruger: $440 ($400 + $30 shipping + $10 transfer)
Python barrel: $290
Shipping to Smith, Fedex insured: $24
Gunsmith work: $395
Texas sales-tax (6.25%): $25
Overnight shipping back to me: $65
Total: $1,239