If you Google "Adams Arms Gas Piston Operating System" you will get some information about the gas piston system this rifle uses. It seems to be an add on "kit" designed to allow a kitchen table gunsmith to convert their DI AR to a piston configuration.
As far as this particular rifle is concerned my answer to you is "I can't tell". Based on the website I can't tell what the rifle's specifications are (the "specifications" tab won't work). What alloys the receivers are made of, what the barrel is made of, whether it is chrome lined, the twist rate, the materials and methods used to construct the bolt and bolt carrier. What type of stock extension (mill spec or commercial)
Here's a link to Spikes Tactical's website for a similar rifle (direct impingement type not a piston)
http://www.spikestactical.com/new/z/st15-16-m4-le-carbine-p-387.html
I am posting this not just to suggest this as an alternative but primarily to illustrate the kind of information that should be provided by a legitimate company trying to sell you an AR type rifle.
So, For 8 bills they are selling a rifle of undisclosed provenience with an aftermarket drop in piston kit installed
My recommendation is to buy a quality DI AR for the following reasons:
1)The DI pattern AR has been in continuous use by the US military since the early 60s. Everything that can go wrong with it is known. The wear patterns, parts replacement schedule is known. Every single place in that rifle that can hold 1/2 a gremlin has been mapped. With a piston gun (and each type will be different) there are a whole bunch of new issues such as carrier tilt, abnormal/accelerated receiver wear, abnormal/ accelerated bolt wear, sheared bolt lugs etc. And, we don't know how all of the proprietary parts will hold up over the long haul. Congratulations! you are the beta tester...
2)There are virtually unlimited sources of spare parts, upgrades and aftermarket goodies for the DI. From online sites, paper catalogs, stores or gun shows to SHTF scavenging scenarios. With a piston system the gas block, piston, springs, bolt carrier and sometimes the bolt are all proprietary with only one (usually under-financed) source.
My advice would be to buy a Spikes or similar quality DI AR.
