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piston

A piston is a component of reciprocating engines, reciprocating pumps, gas compressors and pneumatic cylinders, among other similar mechanisms. It is the moving component that is contained by a cylinder and is made gas-tight by piston rings. In an engine, its purpose is to transfer force from expanding gas in the cylinder to the crankshaft via a piston rod and/or connecting rod. In a pump, the function is reversed and force is transferred from the crankshaft to the piston for the purpose of compressing or ejecting the fluid in the cylinder. In some engines, the piston also acts as a valve by covering and uncovering ports in the cylinder wall.

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Recent contents
  1. Doc_Chao

    WTB OR  ar15 piston kit

    Looking for a low profile piston kit carbine length. 0.750" low profile gas block type. Either adams arms or superlative or any other brands that you guys might know of. Have a few things to trade or cash.
  2. A

    Hogan 308 piston driven AR-10

      1. For Sale
    • $1580
    • Snohomish
    • Washington
    I have for sale a Custom built Hogan H-308. AR-10 w/ 16" barrel in.308 cal (NATO 7.62). $1,580. I paid $2600.00. Hogan used to build all POF USA's rifles. This rifle is short stroke, gas piston operated with rotating bolt. Piston driven rifles eliminate carbon fouling on the bolt and bolt...
  3. G

    Adams piston upper build

      1. For Sale
      2. For Trade
    • $800
    • Seattle
    • Washington
    For sale or trade Adams piston upper with a Rainier Arms upper receiver, Colt 16 in. heavy barrel (I believe it is a SOCOM). Fore end made by Samson says Adams on it. It is un-fired. $800.00 cash or 850.00 trade
  4. 308

    Piston Driven AR retrofit?

    Issue: One of the first world problems I have is shooting the AR suppressed and getting all that gas blowback in my face as well as having the chamber/BCG completley polluted in short fashion. Question: Has anyone here (assuming so) found a piston driven kit with adjustable gasblock to solve...
  5. powermad

    It seems the piston rifles are being dropped.

    Ruger has dropped all piston AR's and Sig has dropped the 516. DI rifles outselling piston ones? That would be my guess. Ruger only lists the AR-556 now. I wonder is a DI .308 is in the works for them.
  6. Hal OPeridol

    AR gas piston builds using VZ58 system

    I recall a while back, notsure if this forum, folks using the gas system from a VZ58 kit and modding it for use in an AR build. Anyone else remember, or might know what site it was on?
  7. czgunner

    WTS WA  Mid Adams Arms piston kit with Samson handguard

    ***SPF*** Midlength gas Adams Arms piston kit. This kit only has about 60 rounds through it. Includes extended Samson handguard with "notch" for gas block, and new bushing $225 $200 you pay shipping or can meet in Hazel Dell.
  8. T

    WTS/WTT WA  7.62x39 Gas Piston, Side Charging AR

    Selling my AR-15 that shoots AK-47 bullet, (7.62x39) operates with gas piston system and is non-reciprocating side charging. Gun is beautiful and is a blast to shoot. Not like any other AR at the gun range. Loaded with upgrades. List of parts: Gibbz Arms G4 Side Charging Upper Receiver ATX...
  9. 808mp5

    WTS/WTT OR  SilencerCo 1/2x28 Piston $65

    New unopened SilencerCo 1/2x28 Piston $65 Or trade for 9mm/223/556/300bo ammo Can meet in the greater Portland/Vancouver area
  10. JCORD

    WTS OR  LWRC gas piston 5.56 upper

    Closed
  11. rockwell

    WTS WA  LWRC M6A2 Piston AR15

    SOLD SOLD SOLD SOLD LWRC M6A2 16" Piston AR15 WTS for $1,300.00 w Geissele, sights and 2 new mags. WTS for $1,100.00 w/o the Geissele SSA-E trigger. WTS for $1,000.00 w/o the Geissele trigger, w/o the sights and with no mags (optic ready and stock trigger). I paid $2,200.00 new at Rainier...
  12. bbowl

    WTS/WTT OR  Silencerco piston

    Sold
  13. bigbruce49

    Ruger SR556E

      1. For Sale
    • $1300
    • Canby
    • Oregon
    I have a Ruger SR556E with a Vortex strike fire2 and a VORTEX vmx3t 3x magnifier for sale. I am asking $1300. I have put approx 300 rounds through this rifle and love it, but life happens.:( willing to meet at an FFL DEALER AROUND Clackamas area for transfer.
  14. ssg_smetz

    WTS/WTT OR  Db15 piston AR

    I have a piston operated DiamondBack ar15, chambered in 5.56 but also have a 300blk out barrel and piston tube. Upgraded trigger, strike industries charging handel. Upgraded 416 stainless steel barrel. Trophy scope. Over 2500 into this gun and i will throw in a bunch of extras. Asking 1200 or...
  15. Erik PDX

    Adams Arms AR-15 | Piston

      1. For Sale
    • $750
    • Portland
    • Oregon
    I have a 16" Adams Arms made piston AR for sale. In great shape with maybe 500 rounds through it. Perfectly reliable with any ammo I've tested. Includes a couple P-Mags. Upgrades include VLTOR stock and BCM Gunfighter charging handle. Price is $750 obo. Potential Trades (cash could go either...
  16. Gagepv

    WTS WA  LMT AR 15 Piston driven 2000$

    Bought brand new in spring of 2015, moved to alaska shortly after and it sat for 2 years. Moved back in 2017 and have not shot it since, sadly. Im an AK guy. Has a few mags through it. Iron sights. 3 mags. Soft Ar case. Incredible rifle, just not used at all. 18 inch barrel. 350 rounds of .223...
  17. soltangris

    WTS OR  suppressor Piston 13.5x1MM LH

    25 bucks, this piston was used with my AAC TiRant 9mm.
  18. Quartermaster

    WTB OR  SilencerCo 16x1 LHM Piston

    Cash in hand for a SiCo piston 16x1LHM today.
  19. kevlar

    WTT OR  Adams Arms piston

    Wrong section sorry
  20. pogi

    WTB OR  SWR Trident 9 piston or 3-lug adapter

    Nothing to see.
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