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1168
01-29-19, 12:00
I still qual with the M16a2 and a4 a couple times a year, and teach same. However, I only touch one a few hours per quarter. So I wanted to put together a similar rifle to keep up with that. That plan, however, went off the rails because I’m a habitual tinkerer. So instead, I built what I feel the M16a4 or a2 should have been. It still has rifle length irons and a fixed stock, so there’s still some training value.

Recipe:
PSA Dissipator 16” barrel assembly
A1 stock
DD A1.5 rear sight
Aero no forward assist upper
A2 FH
BRT EZ Tune gas tube
GGP lower
Sionics LPK
EDT2 trigger
Colt or FN RE, buffer, spring
DD grip
Brownell’s 20’s
Forward Controls Designs BCG
Gasbuster charging handle
BFG Vickers sling
Magpul handguard

Rationale:
This barrel is the only PSA product I own. Faxon has discontinued their dissapator barrel, so unless I pay Adco to make one, PSA is the only game in town. It was on sale in the store, so I snagged it. Other than being drilled for Tula or some other garbage low pressure ammo it seems ok. Remedied the gas with one of Clint’s gas tubes. The barrel does not exibit the huge gap under the FSB that is found in internet searches.
Everything was mounted and pinned correctly. It shoots straight, and groups as well as any FN or Colt M16 I have used. Zero’ing the irons was painless and was very close to center. The M4 cuts in the PSA receiver are not quite right, and snagged bullet points occasionally. First round in a fresh mag only. This occurred 3 or 4 times in 100 rnds. Remedied with Aero receiver. The barrel is labeled 5.56 Nato, but it does not measure out that way with Ned’s chamber gauge. It almost measures up, so I think its Wylde. I have no way to verify that, so I only run .223 through it. I’ve been using 55gr blems from Precision One. They are local to me and I I buy a 5000 rnd run from them a few times a year. I can recommend P1 without reservation for practice/competition ammo. PSA seems to have QA/QC’d this barrel well, but its still a hobby barrel. It will serve its purpose very well, and it has met my expectations.

I like A1 stocks a lot better than A2 stocks because I’m not a wookie. I prefer the DD A1.5 rear sight because it is simple and near grunt-proof. Its basically a pic rail A1 sight. The Gasbuster charging handle is because thats what I have on hand. I put them on every rifle I own. Similarly, every AR I have and one of my AK’s wears a Vickers sling. I went with the Magpul handguard because it came on the barrel. I’m toying with the idea of swapping on a A1 handguard because They are light and I like the ergos.

I went with the no forward assist upper because I have several of them and I hate FAs. I bought 10 a while ago and still have 5 in my garage. Sample of one, but I saw a forward assist roll pin break at an inopportune time on one of my Rangers’ rifle, and it tied the gun up, hard. Rationally I know its a fluke, but emotionally I have a hard time trusting them. I realize this is silly.

I do not yet have the FCD BCG. Its using a parts bin BCG currently.

The pics include a couple of configurations it was test fired in. I included a couple of pics with a commie gun for size comparison.

https://imgur.com/a/fmw0QeX

1168
01-29-19, 12:09
BTW, the surplus M16a1 stock that’s on it still has its rack number by the charging handle. I put rack numbers on any rifle that I actually shoot, out of habit. Knowing this one’s got history behind its rack number makes me very warm and fuzzy inside.

Circle_10
01-29-19, 12:55
BTW, the surplus M16a1 stock that’s on it still has its rack number by the charging handle. I put rack numbers on any rifle that I actually shoot, out of habit. Knowing this one’s got history behind its rack number makes me very warm and fuzzy inside.

Nice!
I do a lot of Irons-only shooting still, so I'm down with this.
I like it with the fixed stock too. I currently have Type D stocks (precursor to the Type E "A1" stock, but the same length) on both Retro and modern ARs and like them a lot.

markm
01-29-19, 13:58
I run an Iron sight Dissipator style gun almost every weekend. I get nervous about me eyesight/age and no longer being able to hit the 500 yard target... so I keep bringing the gun out to keep sharp.

Hammer_Man
01-29-19, 14:54
Looks like a nice handy rifle!

Esq.
01-29-19, 15:06
Owned a couple of Bushmaster Dissipators several years ago. Sold the uppers off, too heavy for me..... Was in a local gunsmith's shop awhile back and happened to see a Dissipator barrel- Lo and Behold it was one of my old guns barrels! I know because it had a nicked crush washer on it on the bottom of the barrel....Gunsmith said he had taken it off the rifle and put a bull barrel on the gun for the guy as he was making a prairie dog gun out of it.....

Gunsmith owed me a favor so he gave me the barrel as a spare. It was a pretty heavy barrel so I had him turn it down and in doing so lost the front sight tower...it has two little notches where the pins used to be. I built a beater gun with it, Anderson receiver, Palmetto rail that came off a rifle a couple years ago, BCM milspec trigger that was replaced with an MBT, and odds and ends of furniture, BCM blem upper...... Gun shoots under 2" with good ammo so I'm plenty happy with it for the small amount I have in it.....So, I guess I only sort of have a "Dissipator" anymore.

grizzlyblake
01-29-19, 15:18
Nice, I really like that. It looks like the distillation of a pure American rifle to me. Something to teach a kid to shoot with or grab for a long walk in the woods. Almost like a modern incarnation of an old 30-30 lever rifle. I bet it carries nicely balanced just in front of the receiver with a 20rd mag in it and no sling.

Circle_10
01-29-19, 17:01
I run an Iron sight Dissipator style gun almost every weekend. I get nervous about me eyesight/age and no longer being able to hit the 500 yard target... so I keep bringing the gun out to keep sharp.

I'm still in my 30's for a couple more years, but I have really atrocious eyesight so shooting irons is part of my regular "stay sharp" routine too.
Sadly I don't have access to a 500yd range but if I can keep my five-shot groups under 4" at 100 yards with iron sights and XM193... or four or five five-round groups under a cumulative size of 5", I can usually live with that.

1168
02-18-19, 08:13
Nice, I really like that. It looks like the distillation of a pure American rifle to me. Something to teach a kid to shoot with or grab for a long walk in the woods. Almost like a modern incarnation of an old 30-30 lever rifle. I bet it carries nicely balanced just in front of the receiver with a 20rd mag in it and no sling.

Absolutely. Although, I am experimenting with slings.

In case anyone is following this path, I just found that M16/A1 handguards don’t fit due to the middie gas block. I kinda want to do a proper 605 clone now.

Dr. Bullseye
02-18-19, 11:04
I love irons. It is simply more fun to shoot and hit the target with irons only. These new irons have surfaced recently and I have ordered them. By all accounts they really do add quite a bit of capability as compared to the A2 set up.

https://ultradyneusa.com/

It is claimed they are faster and more accurate.

1986s4
02-25-19, 18:34
I love irons. It is simply more fun to shoot and hit the target with irons only. These new irons have surfaced recently and I have ordered them. By all accounts they really do add quite a bit of capability as compared to the A2 set up.

https://ultradyneusa.com/

It is claimed they are faster and more accurate.

I am also an iron shooter ! I heard about those sights and I would love to have some but they are pricey. I just built the iron sight gun that I wanted. Bow to stern: A2 FH, 14.5 Colt SOCOM barrel, Magpul SL handguard, A1 upper [not sure of brand but it's a Anchor Harvey forge], Colt BCG, LMT stripped lower, Colt LPK, Geissele buffer tube, buffer and super 42 spring, Colt buttstock. It's an odd combo but I like it. What really helped is the KNS pin head front sight with the little globe on the top painted gold.

Caduceus
02-25-19, 20:31
I went similar with a KISS iron rifle; a few months ago I got a few PD trade-in Bushmasters from my LGS. Pulled the HBAR barrel off one, since it had an A2 upper receiver. Threw on a 11.5" Colt barrel with a FSB. Sort of a CAR-15 type of gun. It's sitting on a pistol lower currently though I do have a spare Form 1'd lower.

I'd done a irons only Dissy in the past and it shot great. Just didn't like having a screw-on carry handle and ended up selling it. Still, great shooter, soft and easy accuracy with that long sight radius.

1168
02-25-19, 20:52
I did manage to get A1 handguards on the rifle. I had to modify the heat shields. The first range session will tell me how bad of a mistake this is. They are Brownell’s replicas, so I’m not super concerned.

1168
03-14-19, 16:34
The modified A1 handguards are working just fine, surprisingly. Just have to be careful not to put my finger over the vent hole directly above the low-pro gas block.

Latest change is a G SSA trigger. It probably won’t stay in there for very long before it gets a ALG ECT, since that is more in keeping with the intended use as a “practice” gun. But I’m enjoying it for now.

This gun is super fun. I need to build a 1/7 twist 605 clone now.

1168
03-18-19, 07:57
Friday I pulled the flash hider to replace the crush washer with shims, with the intent of mounting a M4SDk. I found that there is a false shoulder or step, almost exactly 9/16” in diameter. It held the 1/2” shims approximately a mm off the shoulder. So now I need to buy a 9/16” shim set to bump the shoulder forward. Or send it to a competent barrel guy to get cut back and rethreaded, since I now doubt the concentricity.

I stopped by a PSA store and found that every barrel on the shelf branded PSA has this false shoulder. So, it seems that this barrel meets PSA’s “specs” for threading. While this barrel is fulfilling my needs, it is not a true 5.56 chamber (which it is marked for), and it is not as suppressor friendly as most AR barrels. Keep this in mind if you are considering a PSA barrel.