[Angelito]

The washer will help, but I can't say how much compared to the Delta P adapter. Just make sure that the washer is actually crushed to some degree. My dimension for the gap is approximate, not all SOCOMs have the same amount of gap, so you would have to experiment to find what works best for your setup.

The problem is that the gap produces an expansion chamber that allows gasses to expand and swirl around the bullet. The gasses produce enough force that the bullet gets pushed around just before it leaves the muzzle.

Any insight on when or where to find a delta P?

 

[RAMMAC]

Any insight on when or where to find a delta P?

That's the bad news, from what I understand Delta P sold to another company who has not been making the adapters, but I have heard some rumors that they will. I have no information on where to get any used Delta P adapters, other than to recommend searching the Internet from time to time for them. Smith Enterprise (SEI) makes an adapter, but I've never worked with one, so I don't know if it actually eliminates the gap. Luckily, I bought mine years ago.

 

[anthonypd]

Smith Enterprise (SEI) makes an adapter, but I've never worked with one, so I don't know if it actually eliminates the gap.

It does not

 

[ShootingSight]

I'm working on an adapter to mount a suppressor, and my thought was exactly to tolerance it so it would seat on the barrel face, rather than the shoulder of the barrel. RAMMAC, could you PM me, so I'm sure I understand the dimensional difference that the Delta P used? I'm still in the design phase, so easy to modify what I'm doing. Unfortunately, also still in the learning phase, so not 100% sure of what I don't know. The cutaway drawing is extremely helpful.

Art

 

[ShootingSight]

So my brain is farting here as I stare at the drawings. Not sure I get how the Delta P worked. Adapter to screw all the way to the face of the barrel is easy. But how do you fasten the locking ring with the front sight? It will now be set forward by a bunch, so the gas plug won't reach. Or, if you add a collar and just screw the gas plug in without the locking ring, how do you time the locking ring? Or is this a custom locking ring with a bigger diameter thread?

Maybe I just need more coffee.

 

[anthonypd]

I'm working on an adapter to mount a suppressor, and my thought was exactly to tolerance it so it would seat on the barrel face, rather than the shoulder of the barrel. RAMMAC, could you PM me, so I'm sure I understand the dimensional difference that the Delta P used? I'm still in the design phase, so easy to modify what I'm doing. Unfortunately, also still in the learning phase, so not 100% sure of what I don't know. The cutaway drawing is extremely helpful.

Art

If you need me to send you a spare delta p to inspect and then send back, let me know.

 

[anthonypd]

So my brain is farting here as I stare at the drawings. Not sure I get how the Delta P worked. Adapter to screw all the way to the face of the barrel is easy. But how do you fasten the locking ring with the front sight? It will now be set forward by a bunch, so the gas plug won't reach. Or, if you add a collar and just screw the gas plug in without the locking ring, how do you time the locking ring? Or is this a custom locking ring with a bigger diameter thread?

Maybe I just need more coffee.

The gas lock and the section that the brake attaches to are separate parts. The brake threaded part threads directly onto barrel so that it registers to barrel without any gap. Then, the lock section rotates on thread like a typical gas lock. A set screw tightens it so it stays indexed.

 

[Angelito]

Update: post range test

Shot 80 round with significantly better groupings. Washer not thick enough, still had gasses getting passed it. Will be trying again with thicker .043 or .042 thick washer. No damage to barrel crown. Any thoughts?

 

[Sniper_M-14]

Would stainless steel tape with a washer give a crush fit?

 

[Angelito]

Don’t want to put anything that will come apart and risk failure.

 

[RAMMAC]

I agree, no tape or other layering. Also, when you find that right size washer, get a few of them because I suspect that over time you will get some flame cutting and you will have to replace the washer.

 

[dogfoot]

If I did go with the “washer fix” which metal would be preferred: brass, stainless steel or just plain steel?

Dog

 

[anthonypd]

For reference, the threaded piece for the break section of the delta p is threaded on inside and out (the out of wrap one here is seen with a 5/8x24 thread protector on it).

The inner threads allow you to index the adapter to the barrel.

One screwed onto the barrel, slide the gas lock onto the adapter piece and rotate onto the threads.

Then, lock it into place utilizing top set screw.

 

[Angelito]

If I did go with the “washer fix” which metal would be preferred: brass, stainless steel or just plain steel?

Dog

Stainless

 

[Angelito]

View attachment 594144

For reference, the threaded piece for the break section of the delta p is threaded on inside and out (the out of wrap one here is seen with a 5/8x24 thread protector on it).

The inner threads allow you to index the adapter to the barrel. View attachment 594145

One screwed onto the barrel, slide the gas lock onto the adapter piece and rotate onto the threads.

View attachment 594146
View attachment 594147

Then, lock it into place utilizing top set screw.

Sweet deta p… can I have it. Jk thanks for reference.

 

[Angelito]

I agree, no tape or other layering. Also, when you find that right size washer, get a few of them because I suspect that over time you will get some flame cutting and you will have to replace the washer.

Will do, I think until delta p starts selling again that will be my fix.

 

[RAMMAC]

I'm looking forward to hearing how well you tune your groups. Depending on the bullet weight, I've found that there are two powders that just work all the time, IMR 3031 and AR Comp. Other powders work, but no matter what bullet I use, if I try either of those powders I can always get MOA or better groups.

 

[ShootingSight]

If I did go with the “washer fix” which metal would be preferred: brass, stainless steel or just plain steel?

Dog

Typically, stainless has a higher chromium content, which withstands flame erosion better. That said, the flash hider is just regular steel, so no reason you should need anything more than that.

 

[ShootingSight]

I'm ending up with a design that looks a lot like the Delta P, where I solve the problem by making it two parts. The gas lock screws onto the barrel and secures the gas cylinder, and then a separate thread adapter screws into the gas lock until it seats on the barrel face, assuring a good fit. I'm not in love with the set screw though. I'd replace that with just using Rocksett. After all, once you assemble the two parts to get the correct gap for your barrel, you never need to change that. If you clean the gas system, you'd remove the two components together.

 

[Whipped Cream Head]

Just for s•••s and giggles, I’d probably try a piece of garlock gasket material as a crush washer. I’m not sure how long it would resist flame cutting, I’m guessing long enough to make it worthwhile, but it would be easy to make and replace and relatively inexpensive.