Decouplers/LID/Nielsen/Piston question...

[MCKNBRD]

While still waiting on my .22LR and .30 cal stamps, I'm toying with the idea of another stamp for a pistol can.

Looking over the various pictures/drawings/diagrams I can find, I see that most all of the Nielsen-type devices are between 2 and 2-3/4-ish inches long, overall.

Why? Is there that much room needed to allow the barrel to move in the pistol's frame? The extra length adds weight and volume to the blast chamber area (increasing FRP, based on what I have learned here), as well as overall length that you can't put a baffle in.

I like the idea of an indexable piston (a la AAC's ASAP system) to help with consistent POI shift (if that is the best way to keep it consistent...the theory is sound, but I have no 1st-hand experience). I've seen several variations of the basic concept, but if ya'll have any ideas/drawings/recommendations, I'm wide open at this point.

Thoughts?

Specs I'm shooting for:
mostly 9mm, but up to .45ACP (yes, it may very well see double duty as a 300BLK sub can, too...)
1-3/8" to 1-5/8" OD
OAL in the 6-1/2" to 7-1/2" range (thinking Ti-Rant-45s size)
SS piston/LID assy & blast baffle, with 7075 baffles afterward, in a 7075 or Ti tube
Baffles will most likely be clipped cones, kinda like the Octane

Thanks in advance!
Byrdman

[gunny50]

Specs I'm shooting for:
mostly 9mm, but up to .45ACP (yes, it may very well see double duty as a 300BLK sub can, too…) - 1-3/8" to 1-5/8" OD - OAL in the 6-1/2" to 7-1/2" range (thinking Ti-Rant-45s size)
SS piston/LID assy & blast baffle, with 7075 baffles afterward, in a 7075 or Ti tube - Baffles will most likely be clipped cones, kinda like the Octane

Thanks in advance!
Byrdman

Piston 17/4 for long term use, also ETG 100 heartened and QPQ would be great but will be more costly in finish etc etc.
Length has also to do with keeping things in line, as it is a moving part it needs clearance.
The shorter the piston unit the more play / larger your opening needs to be in the baffles.
Indexing can be done with several options. I like the away the piston looks like a sprocket (not sure if i used the right word)
Pin in sidewall or pin in the connector will give you the index.
I made several kinds of Boosters for both 30 and 35mm cans. 9 / 40 / 45

for 9 and 45 K would be best also K is great for sub 300BA.

I do not know what machines you have or can use, there are some baffles that can be mixed so you have the best of both worlds, large gas volume of 300BA and also pistol gas volume.


For the 45 / 35mm dia

For 9mm / 30mm dia - did also made a piston like the above 45 cap model for other 9mm silencer model.



edited for spelling and picture
Gunny

[whiterussian1974]

The reason 2- 2.75" is needed for the piston is that only 35% can be effectively used during the spring compression. About .65-.75" is used for the length that screws onto barrel and passes through the endcap. (Maybe you are already accounting for this. I don't know.)

Have you considered alternate methods for relieving inertia? Like my previously posted idea of a movable baffle stack w spring return? This will have the added benefit of adaptive chamber placement and added turbulence.

Then, a lighter recoil spring will adjust for the added mass of tube and attachment.

[Capt. Link.]

While still waiting on my .22LR and .30 cal stamps, I'm toying with the idea of another stamp for a pistol can.

Looking over the various pictures/drawings/diagrams I can find, I see that most all of the Nielsen-type devices are between 2 and 2-3/4-ish inches long, overall.

Why? Is there that much room needed to allow the barrel to move in the pistol's frame? The extra length adds weight and volume to the blast chamber area (increasing FRP, based on what I have learned here), as well as overall length that you can't put a baffle in.

I like the idea of an indexable piston (a la AAC's ASAP system) to help with consistent POI shift (if that is the best way to keep it consistent...the theory is sound, but I have no 1st-hand experience). I've seen several variations of the basic concept, but if ya'll have any ideas/drawings/recommendations, I'm wide open at this point.

Thoughts?

Specs I'm shooting for:
mostly 9mm, but up to .45ACP (yes, it may very well see double duty as a 300BLK sub can, too...)
1-3/8" to 1-5/8" OD
OAL in the 6-1/2" to 7-1/2" range (thinking Ti-Rant-45s size)
SS piston/LID assy & blast baffle, with 7075 baffles afterward, in a 7075 or Ti tube
Baffles will most likely be clipped cones, kinda like the Octane

Thanks in advance!
Byrdman

Nielsen devices contribute to the overall suppression and are no longer a simple "LID". The length in part is to maintain alinement between the barrel and the floating suppressor.The movement of the suppressor is a fraction of a inch in movement in use.