Will this fit a bostitch btmt72394?

Im not 100% sure, but it has fit all of the different brands of that style of air hammers that ive got. Everyone that ive seen seems to have a universal thread on the barrel

NO. I have a CP717. It takes the 0.498 shank. I use a CP 8001 (maybe it is CP80001), quick change on it ; which I am not finding online. This quick change you ask about is for the 0.401 diameter shank which, though more common, will not fit nor work with the CP717. You need something such as this: https://www.amazon.com/Grey-Pneumatic-CHUCK-INSERT-GRY-CH8001/dp/B007QV94JO/ref=sr_1_2?dchild=1&keywords=0.498+quick+change&qid=1602996177&sr=8-2 Or another brand . Look for the 0.498 in the description.

Why does this say Taiwan is a province of China? It's clearly not.

Correct Taiwan is an American ally while china is not.

I can't get this on my ir 121. i've fought it hard, and it won't screw down. i can't get it to thread on after removing the spring. ideas?

I just installed it on an IR 121. It is tricky but after playing around I got it. Take the set screws out. Lube up the tool and the inside collar. Pit the gun in a bench vise. Put a bit into the collar to use as a centering guide. Push down as you turn the collar while also using the bit to make sure it's free moving. The collar will try and cook crooked as you tighten it so you have to work it as you tighten. Once you can't tighten by hand, use a rubber strap wrench and continue until all threads are not visible. Install set screws hand tight. Like I said, tricky but will go.

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Manufacturer	Chicago Pneumatic
Part Number	8940158924
Item Weight	12.1 ounces
Product Dimensions	6 x 3.5 x 1.5 inches
Country of Origin	Taiwan
Item model number	8940158924
Is Discontinued By Manufacturer	No
Color	Silver
Style	Quick Change Chisel Retainer
Finish	Clear
Material	Metal
Power Source	Air Powered
Item Package Quantity	1
Included Components	Quick Change Chisel Retainer
Batteries Included?	No
Batteries Required?	No

Chicago Pneumatic8940158924 Replacement Quick Change Chisel Retainer for the CP7110 Air Hammer

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