Radian Arms, After Burner +Ramjet 

We admit, we were very skeptical that a pistol barrel and micro compensator, costing as much as a budget semi-automatic pistol, was really worth it. However, we were blown away with this barrel / compensator combination on the Glock 45. Support us at gofund.me/70980c74
With the AFter Burner and ramget barrel this was a noticeable reduction in felt recoil and muzzle rise. Accuracy was exceptional and this pistol was "flatter shooting". Bottom line, we recommend this combo in spite of the price point. It's a winner!
As noted on the radian arms website:
AFTERBURNERTM
MICRO-COMPENSATOR
The Radian® AFTERBURNER™ + RAMJET™ combo provide unprecedented recoil reduction and match grade accuracy in a concealed carry package. The threadless barrel design allows for effortless install/removal for cleaning, while LEGAL FOR SALE IN ALL 50 STATES.
The AFTERBURNER™ compensator is machined from hardened 17- 4 SS, enhanced with a DLC (Diamond-Like Carbon) coating. This combination achieves low friction, high hardness, and high corrosion resistance, making overall durability and erosion from muzzle blast a non-issue.
The INTRA-LOK™ mounting system uses the taper lock principle: a tapered locking pin interfaces with an angled V-groove on the underside of the barrel. This perfectly times the compensator as it locks down onto the V-shaped profile on the muzzle end of the barrel.
INTRA-LOK allows the user to simply slide the compensator over the barrel, insert and tighten the locking screw, making for a simple and repeatable installation process.
FEATURES
44% recoil reduction in combination with RAMJET (115g ammunition) Hardened 17-4 stainless steel Taper-lock screw interface; no Loctite, shims, or setscrews needed Angled front faces aid in holstering Available in black DLC No threads, legal for sale in all 50 states Makes length of G19 into G17 length, fitting all G17 holsters