Piston AR15 upper

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11 years 2 months ago #28379 by Siscowet
Piston AR15 upper was created by Siscowet
This looks like a good deal. Does any one know much about Adams Arms and their short stroke piston system?

www.midwayusa.com/product/665965/adams-a...ash-hider?cm_vc=U112
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11 years 2 months ago #28385 by jtallen83
Replied by jtallen83 on topic Piston AR15 upper
I see they make pistol uppers as well, I'll have to do more research there! :usa:

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11 years 2 months ago - 11 years 2 months ago #28399 by OleCowboy
Replied by OleCowboy on topic Piston AR15 upper
They seem to make high quality stuff. The use the QPQ Melonite process for the interior of their bbls. While this is a good in fact great process and its at it PEAK in performance when used in conjunction with oil. Works great with bearing races and other high wear components that are in an oil bath.

That said, here is my concern.

1) Seeing as few of us lube our bbls after ever shot what is the long term wearability of the process as used inside a modern firearm?

2) What bbl life might I expect using this process and most of all what would I suffer in a post degraded bbl as to loss of accuracy and velocity?

On another note I am no fan of piston systems. Not because they are not good, in fact they are, but the problem is proprietary engineering. Can I call Natchez, Midwest or other major gun components suppliers and as for a Adams piston rebuild kit for a upper I bought 5 years ago...I tried calling XYZ but they went out of business 3 years ago....and I already have too many boat paddles as it is.
Last edit: 11 years 2 months ago by OleCowboy.

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11 years 2 months ago - 11 years 2 months ago #28401 by Siscowet
Replied by Siscowet on topic Piston AR15 upper
Good point Cowboy. That is probably the best argument for waiting for some industry standardization in piston systems.
:hijacked:
By the way, I found a 2004 canary yellow vette with only 6017 miles on it. Tempting!
Last edit: 11 years 2 months ago by Siscowet.

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11 years 2 months ago - 11 years 2 months ago #28403 by OleCowboy
Replied by OleCowboy on topic Piston AR15 upper

Siscowet wrote: Good point Cowboy. That is probably the best argument for waiting for some industry standardization in piston systems.
:hijacked:
By the way, I found a 2004 canary yellow vette with only 6017 miles on it. Tempting!

Low mile could be a good buy???

However one has to be cautious as low mile might be...'67 L88 only 536 miles! Page 2: Car was totaled at 536 mi land has set behind a barn in pieces since 1967...(real story)
Last edit: 11 years 2 months ago by OleCowboy.

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11 years 2 months ago #28405 by Siscowet
Replied by Siscowet on topic Piston AR15 upper
Has Car Fax and I know original owner.Will be doing more research.

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11 years 2 months ago #28411 by OleCowboy
Replied by OleCowboy on topic Piston AR15 upper
Great, keeps us in the loop....

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11 years 2 months ago #28416 by mrraley
Replied by mrraley on topic Piston AR15 upper
back on topic here...

IMO: the piston upper was a solution to a problem that did not exist.

and,

The piston uppers still have to many problems that have not been worked out yet.
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11 years 2 months ago #28451 by Siscowet
Replied by Siscowet on topic Piston AR15 upper
All the piston uppers are only trying to solve the same issues that the AR 18/180 series did in the 1960's. Nothing really new except for the metallurgy.

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11 years 2 months ago - 11 years 2 months ago #28454 by mrraley
Replied by mrraley on topic Piston AR15 upper
BUT...

The AR-18/180, the AK series, and the M-240, M-249, M-60's bolt system runs on a type of a rail to prevent it from carrier tilt. These new ones for the 15 series do not.

This is where they run into problems.

1. Uneven wear or scaring the bottom of the receiver extension tube as the op rod pushes the top of the BCG, the bottom rubs against the receiver extension tube.

2. More moving parts and springs.

On the same line with carrier tilt.

3. If the carrier tilts enough before it comes out of battery, it does have the possibility to break the bolt at it's weakest point. The cam pin hole. That is where the walls are the thinnest.

on a side note...

4. It is claimed to run cleaner... FALSE ... It just relocates the carbon to a different location (under the handguard). You still have to clean it. If you do happen to run it suppressed, it still put the residue in the receiver.
Last edit: 11 years 2 months ago by mrraley.
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