Who wants you hold their 10-22 bolt closed longer?

[Gordo]

Noticed long ago that with even very low power .22 RF rounds, like CB Longs that the 10-22 bolt cycles way too soon.
Some people mask it with using soft buffer (rear most pin) to dampen the bolt.
I've always thought that a heavier bolt, or spring would slow the bolt more.
So I first set out to install a Wolff heavy spring, but it didn't slow it enough for my liking.
So, besides making a bolt out of tungsten, or machining the stock bolt to take tungsten inserts, I decided to go a different direction.

Detent bolt locks, kind of a variation on roller locks.

Let the drunk hate begin...

 

[V-Tach]

I drilled the bolt and installed tungsten plugs to give the bolt more weight when firing from an open bolt............

A closed bolt is very slow to cycle compared to an open bolt 10/22........

Disclaimer It was a legal Post Dealer Sample........

I know ............apples to oranges, but interesting none the less........................

I appreciate your innovation............

 

[Lead Belly]

That looks pretty clever. Appears as if it will put a bit of upward pressure on the bolt, as well.

Would love to see a slow-mo comparison of the modification to see how long a delay you get, as well as chrono difference.

 

[Nicholst55]

Will it eventually wear two grooves into the aluminum receiver?
Will it matter?

 

[Gordo]

The detents are from McMaster-Carr.
Detents
They exert 2 lbs force at full extension, 5 lbs at full compression (each).
Total travel is only .035", and they only engauge the bolt the last 1/8".
The next time I have it down, will measure what force it takes to pull the bolt back from battery, but it is noticeable when charging the rifle.

I keep forgetting that my phone will take super slow motion vids.
Used that feature many times when actually working, to show the dumb-ass engineers why their machinery wasn't working.
Will drag someone along to the range the next time I have it out.

Haven't seen any wear on the receiver as of yet, but I lube that area with grease, and like I said at the start of this post, the bolt is only on them for the first 1/8" of travel.
But you are correct, it would effect lockup if the receiver would wear much at all.
If I detect any, I will coat that area with either KG Gun Kote, or the same moly coating I use on pistons.

 

[David C]

That’s a pretty nifty idea. How many rounds have you put through it after the detents?

 

[Gordo]

About a hundred rounds.

 

[PinnedandRecessed]

I see the utility of changing bolt speed with a full auto but what's the benefit in a semi 10/22?

Asking for real.