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chf
Hafnium carbide (HfC) is a chemical compound of hafnium and carbon. With a melting point of about 3900 °C it is one of the most refractory binary compounds known. However, it has a low oxidation resistance, with the oxidation starting at temperatures as low as 430 °C.Hafnium carbide is usually carbon deficient and therefore its composition is often expressed as HfCx (x = 0.5 to 1.0). It has a cubic (rock-salt) crystal structure at any value of x.Hafnium carbide powder is obtained by the reduction of hafnium(IV) oxide with carbon at 1800 to 2000 °C. A long processing time is required to remove all oxygen. Alternatively, high-purity HfC coatings can be obtained by chemical vapor deposition from a gas mixture of methane, hydrogen, and vaporized hafnium(IV) chloride. Because of the technical complexity and high cost of the synthesis, HfC has a very limited use, despite its favorable properties such as high hardness (>9 Mohs) and melting point.The magnetic properties of HfCx change from paramagnetic for x ≤ 0.8 to diamagnetic at larger x. An inverse behavior (dia-paramagnetic transition with increasing x) is observed for TaCx, despite its having the same crystal structure as HfCx.
Selling my mint Palmetto State Armory AK-103 premium, which has the fantastic FN cold hammer forged, chrome lined barrel. Includes original paperwork and unused magpul 30 round pmag. Sights aren't canted and the rifle seems dang straight. Rivets are excellent. Black poly furniture and left...
I have a brand new in box Colt LE6920 16" AR. No, these are not the new AR's that Colt just started producing again. These have the "M4 Carbine" roll marks. I don't have any photos tonight but can get them tomorrow. I can also possibly throw in a PSA 10.5" AR pistol with a CHF barrel. At this...
Reduced!
NOTE: Upper and BCG/charging handle are new, MI handguards and carry handle sight are lightly used. This upper was installed on a lower but I never fired it. Sad I know....
PSA factory assemble upper with logo. This has the PSA premium CHF barrel made by FN. 5.56 Nato chamber and...
I have an Upper from PSA that i was going to build but not going to anymore , will sell for cost less shipping that i paid. Not is stock and great for an accurate pistol build , its an FN barrel but i just need to get rid of projects .
Barrel Length: 10.5"
Barrel Profile: A2
Gas System...
Selling a PSA Dissipator carbine with FN CHF Barrel. The barrel does not have the FN roll mark but is FN per PSA. Installed is a LaRue straight bow MBT trigger and Magpul BAD lever. Will include one NIW Pmag, IDF sling and original box. Original owner, carbine has less than 500 rounds fired...
I made a quick video that compares the upper rails on two rifles;
First you see my "old" AR15, purchased as separate upper and lowers from PSA, the upper is a 16" Premium CHF model from several years ago. I've swapped at least 15-20 different optics on and off this rail and the workmanship...
For sale is a Alpha Shooting Sports 16" 416R Stainless 223 Wylde, 1:8 Twist, Spiral Fluted, Mid-Length Gas, Dimpled for gas block Cold Hammer Forged (CHF) Barrel. Shoots very smooth, and is MOA accurate. Perfectly gassed at 3 oclock ejection. Spiral Fluting takes away some of the weight without...
Geissele MK14 handguard with geissele gas block, aero mid length gas tube, and the geissele tool
$250 (SOLD)
Rainier Arms Green mountain barrel, CHF made by FN, 16" midlength, mid weight profile, and an a2 flash hider (250 rounds down this barrel) $200 (can add aero NiB BCG for another $125 that...
* Sorry about the "lengthy" description, and now "SALE-PENDING" by the way, however you'll see why once you get through the read. On a positive note I added a lot of pictures for your "viewing pleasure" to make up for the additional reading you had to endure.
Thanks in advance..!!
The...
Built of quality parts: Aero slick side upper, ALG Defense 13" FDE handguard, Rainier Arms 13.5" CHF Barrel, Rainier Arms gas tube, Daniel Defense flash hider and gas block. No BCG or CH included, but does come with an SBA3 brace.
13.5 is an excellent compromise for performance and...
Spikes Tactical Complete upper 16in Cold Hammer Forged barrel with FSB Includes bcg and ch. upper is still sealed in the factory plastic bag. Yes it includes the factory BCG and charging handle. Also included with this one is a PSA lower parts kit that includes a Magpul moe grip. No trades please.
SOLD
Bought two. Only need one.
Palmetto State Armory (PSA) upper with free floated 18-inch FN Cold Hammer Forged barrel A2/A4 profile. Wylde chamber with 1/8 twist and rifle-length gas system.
It is as PSA sent it, no modifications whatsoever. Barreled upper, no bolt carrier group or...
Have a practically new 18” PSA rifle for sale..
18” FN CHF barrel 223 wylde
PSA premium bcg
Fortis Red Stainless 3port muzzle break
15” keymod rail
Noveske keymod Hand Stop
2 pmags 30rnd
Anti Walk pins
would be a nice gun for 3gun
600.00 cash.... transfer preferred at Cut Above Pawn and fee...
Got a DDM4v5 in 300blk and decided I wanted to swap in my 5.56 barrel. Barrel has VERY low round count and comes with the Daniel Defense has block and flash hider. These sell new for $299. Asking for $150 with gas block and hider.
Price is OBO, make me an offer!
Possible trade for AR pistol...
************ > SOLD 12/30 < ************
* NEW IN BOX / ROUND COUNT IS ZERO
Does not include BCG / or charge handle
14.7" FN M4 barrels cost $299 - $349 depending on where you look (just the barrel). That being said you'll be hard pressed to find a better deal than this listing.
This is a...
************ SOLD ************
If you have looked for a FN 14.7" SOCOM (heavy profile) M4A1 barrel you know these are not easily found / almost "Unicorn" status and when sourced the barrel alone is in excess of $300 dollars (this is a new in box factory assembled upper).
Now onto the post -
*...