CNC vs. Cast M10/9 Bolt

[StenAtopia]

Anyone know the ROF difference between a Cast and CNC M10/9 bolt might be? I know the cast bolt is lighter?

 

[GK8041]

Negligible. Not a precise answer - but the CNC bolt is a bit heavier, blockier, and perhaps runs slightly slower - seemingly for me anyhow. Ammo selection plus suppressor can also affect ROF.

I’m running a CNC bolt in a Fat Ghost upper, with optic…and store the original upper, bolt assembly and wire stock. With the mini Uzi style folder, this configuration allows for a much more enjoyable and ergonomic range experience over the original configuration. I can shoot bursts of 3 consistently, 2 less consistently. I have not been able to squeeze singles from FA.

 

[StenAtopia]

Is it possible for some one to weight there CNC complete bolt assembly please. Thank you.

 

[Slowmo]

Perhaps someone could mill off a portion or mill out a pocket and replace it with tungsten.

 

[A&S Conversions]

If you are looking for a slower rate of fire, the CF(W) A1 bolt would give around 850 Rounds Per Minute with .380 and 1,000 RPM in 9mm. They are not universal. It is my understanding that because of the slower ROF, the tungsten bolt will run 9mm only in a large magwell M11 and .380 in the small magwell. The small frame M11 mags are not long enough to put 9mm in and the Zmags and Pam 2 mags feed lips are too short to support .380 slowly feeding into the chamber. With a standard steel bolt the Zmags and Pam 2 mags will feed .380. But the slower tungsten bolt .380 feeding from the 9mm mags, has a greater distance from the end of the feed lips to the chamber. With the shorter overall length of .380 the longer distance from the end of the feed lips to the chamber causes FTF stoppages.

You certainly could get a local gunsmith to drill your steel bolt and install some tungsten. What kind of ROF reduction are you looking for? Increasing the mass, lengthening the stroke, and reducing spring rates will all tend to slow ROF. Of course a full auto firearm is a balance of these systems. There needs to be enough energy in the bolt group to cycle. Each one of these things can be adjusted somewhat, but will tend to effect reliability if not factored into the system.

Scott

 

[StenAtopia]

If you are looking for a slower rate of fire, the CF(W) A1 bolt would give around 850 Rounds Per Minute with .380 and 1,000 RPM in 9mm. They are not universal. It is my understanding that because of the slower ROF, the tungsten bolt will run 9mm only in a large magwell M11 and .380 in the small magwell. The small frame M11 mags are not long enough to put 9mm in and the Zmags and Pam 2 mags feed lips are too short to support .380 slowly feeding into the chamber. With a standard steel bolt the Zmags and Pam 2 mags will feed .380. But the slower tungsten bolt .380 feeding from the 9mm mags, has a greater distance from the end of the feed lips to the chamber. With the shorter overall length of .380 the longer distance from the end of the feed lips to the chamber causes FTF stoppages.

You certainly could get a local gunsmith to drill your steel bolt and install some tungsten. What kind of ROF reduction are you looking for? Increasing the mass, lengthening the stroke, and reducing spring rates will all tend to slow ROF. Of course a full auto firearm is a balance of these systems. There needs to be enough energy in the bolt group to cycle. Each one of these things can be adjusted somewhat, but will tend to effect reliability if not factored into the system.

Scott

Thank you for the input but this is for a M10. Just wanting to know the weight difference between a cast and CNC “M10/9” bolt. That’s it. Specifically if someone can weigh there complete CNC bolt. Thank you all in advance.

 

[MitchWerbellsGhost87]

Don’t know the weight difference but I can say with confidence that the earlier SWD “slab side” CNC bolt is heavier and slower than the original cast “speed bolts”. In 9mm it’s noticeably slower than the cast bolt, not sure about .45 and also not sure how the modern CNC examples run… this is only in reference to the early SWD CNC bolts that still used the original cast bolt extractor

 

[llamasabound]

Anyone know the ROF difference between a Cast and CNC M10/9 bolt might be? I know the cast bolt is lighter?

I found a 4oz weight difference between the original 1973 cast bolt in my M10 and the new CNC one I purchased. ROF difference for my standard 124gr ammo was also noticeable: the CNC bolt in an M10/9 is the slowest near factory configuration, around 1000 rpm.

I’ve since sold my M10/9 or I would have weighed them for you when you first asked: but the difference was at least 4oz when I did.

 

[woodenword]

While it probably doesn’t help you, I just measured the difference between an M10/45 cast and cnc bolts. The cnc bolt is just over 2 oz heavier.

 

[nklf]

Are CNC bolts still available? Since the CFW M10 bolts never materialized, I would be interested in finding a CNC bolt if it is heavier and would slow the M10/9 down a little.

 

[StenAtopia]

Are CNC bolts still available? Since the CFW M10 bolts never materialized, I would be interested in finding a CNC bolt if it is heavier and would slow the M10/9 down a little.

I think that’s all that’s available for the M10’s. FTF, practical solutions and other vendors show them in stock.

CNC MAC 10 M10 9mm SMG FULL AUTO BOLT ASSY (for Double Stack Mags)

Check out the deal on CNC MAC 10 M10 9mm SMG FULL AUTO BOLT ASSY (for Double Stack Mags) at FTF Industries

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