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ar conversion
Potassium–argon dating, abbreviated K–Ar dating, is a radiometric dating method used in geochronology and archaeology. It is based on measurement of the product of the radioactive decay of an isotope of potassium (K) into argon (Ar). Potassium is a common element found in many materials, such as feldspars, micas, clay minerals, tephra, and evaporites. In these materials, the decay product 40Ar is able to escape the liquid (molten) rock, but starts to accumulate when the rock solidifies (recrystallizes). The amount of argon sublimation that occurs is a function of the purity of the sample, the composition of the mother material, and a number of other factors. These factors introduce error limits on the upper and lower bounds of dating, so that final determination of age is reliant on the environmental factors during formation, melting, and exposure to decreased pressure or open-air. Time since recrystallization is calculated by measuring the ratio of the amount of 40Ar accumulated to the amount of 40K remaining. The long half-life of 40K allows the method to be used to calculate the absolute age of samples older than a few thousand years.The quickly cooled lavas that make nearly ideal samples for K–Ar dating also preserve a record of the direction and intensity of the local magnetic field as the sample cooled past the Curie temperature of iron. The geomagnetic polarity time scale was calibrated largely using K–Ar dating.
Cmmg 22lr BCG used 300 rounds through it
3 black dog mags 1 new 2 used
Speed loader with ar22 adapter and 2 10/22 adapter
3 new firing pin, 2 new extractor and 1 new taccom recoil spring
Taccom pressure plug
Taccom plastic collar made for taccom barrels. Collar not made to fit on cmmg...
Purchased new in October, less than 80 rounds through it.
Works well with 16" barrels & 36 gr ammo 1200+ fps. Does not work well with short 10.5/11" barrels or with 40 gr bulk ammo.
$100 Cash face to face at my shop in Salem M-F 7am-3pm or $120 shipped Paypal, VenMo, or CashApp.
Interested...
I just bought a receiver for an ar 9 project, but have read that skme conversion blocks don't accept mags other than glock mags. Anyone have experience with the blocks and if so do other brand glock magazines work with them?
This is a bit of a unicorn. This will allow for a standard AR receiver to run 45 ACP. . As a set $750
CMMG rotary delay 45 ACP 8" barrel ( shrtened and threaded to 7" ) and bolt set threaded 5/8-24 with a bored out silencerco brake for suppressed use with an ASR silencer. With 45 SOCOM upper...
$1850 shipped. New in box, complete MCX 9” .300 BLK upper assembly in black. Comes with taper cap, SIG match duo trigger for AR lower, buffer tube adapter for MCX upper to run on AR lower, receiver extension.
No trades, just looking to sell. Cheers.