Pictures, gas piston upper half after a cleaning.


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SHvar
June 6, 2009, 03:10 AM
I got this today, cant wait to get a chance to get to the range next week. Ill set the sights, then transfer my Bushnell Trophy T-dot reticle MP scope from the upper half (which will be getting a Bushnell 3-9X40, which is more suited to that uppers accuracy).
Gas piston operating rod, and detent plug.
http://i193.photobucket.com/albums/z281/SHvar/Picture100.jpg
The bolt carrier and bolt, the carrier itself is designed differently, it also has a solid embossment for the operating rod to push while cycling.
http://i193.photobucket.com/albums/z281/SHvar/Picture101-1.jpg
http://i193.photobucket.com/albums/z281/SHvar/Picture102-1.jpg
Double heat shielded handguards, much much larger than normal AR-15 handguards, and oval shaped with a cut out to accomondate the gas piston assembly.
http://i193.photobucket.com/albums/z281/SHvar/Picture103.jpg
http://i193.photobucket.com/albums/z281/SHvar/Picture105.jpg
Front sight, flip up, removable, locks in position with a detent.
http://i193.photobucket.com/albums/z281/SHvar/Picture104.jpg
http://i193.photobucket.com/albums/z281/SHvar/Picture106-1.jpg
Upper reciever, mostly standard M-4A3.
http://i193.photobucket.com/albums/z281/SHvar/Picture107.jpg
http://i193.photobucket.com/albums/z281/SHvar/Picture109.jpg
http://i193.photobucket.com/albums/z281/SHvar/Picture112.jpg
Upper.
http://i193.photobucket.com/albums/z281/SHvar/Picture092.jpg
With DPMS lower, all ready to go to the range.
http://i193.photobucket.com/albums/z281/SHvar/Picture094.jpg
For the heck of it, with bayonet thats been sitting around for years.
http://i193.photobucket.com/albums/z281/SHvar/m4gpbayo.jpg

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1858
June 6, 2009, 04:01 AM
That gas piston upper looks almost identical to POFs original 16" version ... the P-415-16-BP-SF (minus the flutes in the barrel of course) right down to the gas block and handguards. POF has changed some of the internals on their latest models (your piston looks like their old version) but I could swear that your upper came from POF. Does POF make them for Bushmaster by any chance?


http://128.171.62.162/hawthorn-engineering/thr/pof/P-415-16-BP-SF-223(A)240.JPG



By the way, if you want to replace that plastic handguard with a rail, check out Daniel Defence Piston Omega Rail 7.0 (http://www.danieldefense.com/?page=shop/detail&product_id=109), it looks like this when it's installed. My POF came with the same handguards that you have but I don't much care for them ... too fat and slippery for my liking.

http://128.171.62.162/hawthorn-engineering/thr/pof/pof_dd_1.jpg

http://128.171.62.162/hawthorn-engineering/thr/pof/pof_dd_3.jpg


:)

SHvar
June 6, 2009, 12:19 PM
Its a current POF design licensed to Bushmaster who builds it. Bushmaster actually uses 2 different piston systems, one for the retrofit (ARES, who Bushmaster bought Im told), and the POF for the Bushmaster gas piston rifle upper.
Bushmaster may have always been making parts of the POF rifle, or the rifle itself for POF to install their piston, rails, etc. Makes you wonder if POF rifles are Bushmasters with some changes to them. Both are very very close in price.
Aside from the redesigned bolt carrier, gas piston system, Yankee Hill front sight, etc the upper is from a Bushmaster M-4A3.

1858
June 6, 2009, 04:03 PM
Makes you wonder if POF rifles are Bushmasters with some changes to them. Both are very very close in price.

Good point .... maybe POF has/had Bushmaster make their uppers. I know the POF bolt is made by Stag Arms. Either way, there's no question that Bushmaster is using a POF design and it looks like they're selling the older version so the new POF maybe a better deal if they're the same price as you say. I like that the POF comes with a fluted barrel and without that silly grenade launcher groove. :) The bayonet lug on the 16" barrel is only good for mounting an accessory ... not much else.

Is your gas plug reversible? The POF is a two-position version, N for normal and S for suppressed.

Anyway, I'm looking forward to reading your review after you've been to the range.

:)

gvnwst
June 6, 2009, 07:11 PM
I thought it look to identical to my POFs to be a ripoff...:p The BC doesn't look as nice though. ;) :D

I like that the POF comes with a fluted barrel and without that silly grenade launcher groove. The bayonet lug on the 16" barrel is only good for mounting an accessory ... not much else.


The barrel on the POF is match grade too, instead of any old M4 type bbl...(thats what they said it was last time i checked)

SHvar
June 7, 2009, 12:17 AM
POF coats their recievers and bolt carriers in a silver colored nickle teflon coating, the bolts are coated in chrome. The barrels are fluted cold hammer forged (so probably made by a major manufacturer for them considering the cost of the machinery to make them is in the millions) like machine gun barrels in milspec.
The bolt carrier is coated as Bushmaster always does with anodizing, the carrier is definitely not close to normal (hard to see in the pictures), and a bit heavier.
Bushmaster is licensed to produce the POF piston system for use on this rifle (although they wouldnt tell me what the company was that designed it). Maybe from the beginning Bushmaster and POF have had a deal with Bushmasters huge production cabability to produce parts for POF, but POF has separate coatings used in their models. Probably POF just assembles the end product, therefore profits better by the partnership.
Both very nice rifles. I wanted the M-4 but I wanted something completely different and decided to go with the cleaner piston design. I priced and compared many companies products, decided to go with bushmaster for what they offer, and the piston rifle upper was perfect.
I wanted the M4A3, so I had the option of the removeable sight/carry handle, but a flat top (Bushamster both are the same price) also. I like the look of the M-4 barrel, and wanted the barrel weight and size it has, not thin, but balanced and light, like the M-16A2 has, only 4 inches shorter. I also like the flip up sight instead of having to install or remove it while switching to and from optics.
The piston has 2 separate ends, one has larger ports, and a second groove cut around it, the other has a single groove and smaller ports. The supplemental instruction that came with the upper says to place the larger ported end in first to reduce recoil noticeably. From what Im told it has very very little rcoil, in fact the lowest of any AR-15 carbine anyone who has shot them reports, similar to a 20 inch heavy barrel model.
Cant wait to shoot it now. Gonna try to get pictures, and video with comparisons from both sides of the piston.
I think the idea of a normal milspec chrome lined barrel and chamber is perfectly fine for it, it doesnt need a cold hammer forged machine gun barrel, the piston increases barrel life by removing heat and carbon fouling from the system to start with (this is why chrome lining was added to the M-16A1 from the original model to improve its cleanliness and durability (the chrome lining is alot tougher than the barrel steel is).
The Bushy is the same system, this is the new POF system, in fact POF still makes the same rifle, only without the rail sections on the handguards, and a different sight (for mil spec purposes), and different coatings inside, but with the fluted barrel. I guess Bushmaster makes POF-USA rifles minus a few unique parts POF uses.
Not my pictures, this is a POF 16 inch rifle upper piston system, other than coatings, identical to my Bushmaster.
http://www.pof-usa.com/images/p9xev.jpg
This is the 20 inch 7.62 piston design, notice the longer piston, and removable embossment on the carrier.
http://www.pof-usa.com/P-416/photos/Gas%20Piston%20Parts%202.jpg

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