Replacing the hammer on a NAA .22lr mini-revolver.

[Pyro]

Hello Everyone,

Thought I'd post my experience opening up and disassembling an NAA .22lr mini revolver to replace the hammer.

***This disassembly may void factory warranties, please refer to your firearm's manufacturer for additional information.***

Just to let everyone know first, the main hammer screw is a left-threaded screw (Part No. 4). This means righty-loosey, lefty-tighty. If you try to unscrew the screw in a traditional manner, lefty-loosey, you may skip threads and destroy the screw/frame as you are actually tightening it. This may not be the case for older models, please research before hand.

Disassembly is easy, reassembly is a pain in the butt. Keeping Part No. 12 hand spring in place was very difficult:

Unlike the .22 magnum version above, where the main spring has the room to be bent into position, the firearm needed to be ready for the sideplate with the main spring compressed under the hammer. I stuck a small diameter screw driver through the threaded portion of the right side of frame to act as the hammer screw to keep the hammer in place and the main spring compressed. This let me get the side plate on without loosing pressure. Make sure the side plate is completely flush to the frame, I used a vice grip on all corners to ensure the side plate was flush. After that it was slowly backing out the small diameter screw driver while I pressed in the actual hammer screw. Before the side plate was in place, the whole time I had my thumb over Part 12 as it popped off a few times.

Hope this may help someone somewhere, however NAA has a life-time warranty. Please take advantage of it!

 

[MedWheeler]

Good information here that I hope I never need. I have one of these guns, too, and really appreciate its craftsmanship as well as its limitations; it gets carried as a BUG a lot, frequently as a second BUG (no. 3 in line.)

What was it that necessitated replacing the hammer?

 

[Pyro]

What was it that necessitated replacing the hammer?

I wanted to see if I could make the gun as small and inconspicuous as possible. I shaved the hammer down to make its height even shorter. It worked very well however I missed having the full-size hammer, so I purchased one from NAA and popped it in.

 

[MedWheeler]

^^ Copy that. Thanks. Was just curious if you'd actually managed to break one.

 

[V-fib]

I put a automotive vacuum nipple over the hammer spur on my .22lr naa. makes it much easier on on the thumb when cocking it back and no sharp edges.

v-fib

 

[Armybrat]

Interesting - I never knew that.
My Mini-magnum is over 30 years old and has been fired less than 50 rounds. The cylinder is pretty wobbly and has a lot of end shake. I wonder if the factory can do anything for it?

 

[351 WINCHESTER]

I sent mine back for a new barrel, and they put a lanyard ring on for free, and they paid shipping both ways.

 

[Armored farmer]

Customer service replaced my hammer when I started having light hammer strikes.

 

[sgt127]

When those things first came out, Wald's Police Supply got a shipment.

I came in and marveled at these little jewels and picked up a .22 short version. It was (is) tiny.

Sol, the owner, relayed to me a story. A mutual friend of ours came into the store and was utterly smitten by the little guns and bought three of them.

Got home and was just fascinated by the little guns and wondered how all those tiny little parts fit together in there....

Out came the screwdriver.

Getting it apart was not a problem....though he recalled hearing a little "click" as the sideplate came off. Kinda like something spring loaded popping loose.

Getting it back together wasn't going as well. After an hour or so, he figured something must be out of place. Being an intelligent fellow, the obvious answer, at the time, was to crack open another one and see what might be going on.

Got the screwdriver out...heard the little click....took the sideplate off.

Two hours later, convinced he was missing something very obvious, he decided looking to see how everything lines up in the third one would be the best course of action.....

Sol said he was at the shop at opening time and looked like he hadn't had any sleep. He was carrying three ziplock baggies full of small stainless steel parts....

 

[Pyro]

I had propped open a plastic grocery bag and placed a clean white piece of paper on the bottom of it. I placed the NAA into this environment and that was my workplace to hopefully catch any super tiny parts that shot out on disassembly. It saved me on one occasion.

@sgt127 Not sure how those old ones were made but that sounds like quite an embarrassing story.

 

[flyingtiger85]

I purchased a spare cylinder pin and a trigger spring just to have in case I ever need it in the future and NAA is no longer in business like Harrington&Richardson someday.I can't ever see why you had to replace a hammer,I've never heard of one of those going bad.

 

[old fart]

i had a naa black widow a year or so back, shot good but got rid of it when i spoke about getting extra parts. i could buy all parts to use if i needed them without sending the gun in, but the problem is that installing anything even a set of sights will void the warranty. what the use of having parts if its gonna void a warranty that a person may need at sometime.

 

[commygun]

How would they ever know if you had replaced a part?

 

[Walkalong]

Just to let everyone know first, the main hammer screw is a left-threaded screw (Part No. 4). This means righty-loosey, lefty-tighty.

Found that out many many years ago. I had to replace the cylinder pin on my .22 Mag I bought in 1978.

 

[robhof]

I put a automotive vacuum nipple over the hammer spur on my .22lr naa. makes it much easier on on the thumb when cocking it back and no sharp edges.

v-fib

I took a Dremmel with a fine polishing wheel and took off all the sharp edges on my hammer, had already done so on many of my B/p pistols after getting ragged thumb from rapid firing them.