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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.
Up for sale is a 20" premium CHF rifle with the fn barrel.
750 for the complete rifle including carry handle
If you want just the upper then send an offer
Selling to fund vet bills so no trades thanks
Sorry, this item has sold
NIB Centurion Arms SOCOM Hammer Forged Barrel, Carbine (14.5 inch)
Just received it today, in the three weeks I was waiting for it I changed my mind! :rolleyes:
I will ship it for free and eat the taxes that I paid on it
Please PM me for any questions
I take...
Does anyone have user feedback for the Centurion Cold Hammer Forged barrels? Specifically wondering about if they are properly gassed and also their profiles. I want a mid length option but it appears that yhe just have their “lightweight” option in stock. I want a barrel suitable for a fighting...
1 Used URX 3.1 13.5" handguard AAC Marked, $245 shipped. SOLD
3 New/Like New URX 3.1 13.5" handugard also AAC marked.
1 with heat shield, $285 shipped
2 without heat shield, $265 shipped each. SOLD
Come with barrel nut.
1 Daniel Defense 16 inch CHF carbine length barrel, 150 rounds.
$200...
WTS, 16in PSA Premium CHF FN Barreled upper. Around 3k rounds through it, it's served me well and has eaten anything I've thrown into it. Will come with an extended charging handle but no BCG is included.
SOLD. Willing to ship.
Have a like new PSA Premium rifle with a 14.7 Cold hammer forged chrome lined FN barrel. It comes with a PSA premium bolt carrier group, Primary arms 1x Cyclops prism with a green ACSS reticle, Magpul pro steel back up iron sights, Stream light protac 1000 lumen light, strike industries extended...
Flush rotary mag model (5 round) - will NOT take AR mags, cannot be converted to take AR mags
Stock Flat Dark Earth Synthetic
Sights None - Scope Rail Installed
Barrel Length16.12"
Material Alloy Steel
Magazine Flush fit rotary - 5 rounds
Twist 1:8" RH
Finish Matte Black
Weight 6.1 lb...
Up for sale are my two PSA 10.5” AR pistols with collapsible brace and CHF barrels.
The first one has the Midwest Industries rail with the nickel boron BCG. Never fired. Asking $700.
The second is your standard 10.5” AR Pistol with a CHF barrel. I’ve put only two thirty round magazines...
This upper started life as a 10.5" factory assembled FN barreled CHF upper (AR-15) however I had a "vision" for it and hears what happened..
Cloud Defense 9.5" CORv1 m-lok "optimized" rail
The rail / handguard is "recessed" to mount a Cloud Defense Owl light or a Surefire pressure pad.
$191.99...
Great basic upper, bought back in 2018 selling as I was intending on using it but don't need it anymore. Has roughly 300 rounds through it, no BCG or charging handle.
Local FTF sale no shipping, will meet in the Beaverton to Yamhill area.
Complete Upper Assembly w/ 16" FN CHF Barrell - only has 150 rounds through it
BCM BCG
Aero Upper
Radians Raptor Charging Handle
YHM 12.8" quad rail
BCM gunfighter muzzlebrake
Daniel defense A1.5 front sight
Magpul mbus rear flip up sight
Located in Kent, can meet up within reason or ship it...
I have a "used" (60rnds match ammo at most). Strike Industries USA MADE StrikeFighter barrel 16" CHF, .750 midlength, 1:8 twist, 416RS. Dimpled for a Superlative Arms adjustable gas block (Can include w/ black gas tube for an extra $85). I believe Aero and BA also share the same .500" spacing...
Selling a brand new unused and unmounted Centurion Arms Cold Hammer Forged, Chrome Lined, Light Weight Barrel. Taken out of the box just for pics.
The barrel comes with an index notch behind the gas port to aid in gas block alignment (for use with Centurion’s tabbed gas block, you can use other...
PSA premium CHF 10.5” upper. Barrel is stamped FN. 556. Comes with BCG and standard charging handle and Magpul BUIS. I will cover 2 day shipping with tracking number; CONUS only. I did a rattle can on this one. Runs like new and super fun shooter. Comes with 12” MLOK rail and flash can.
1 available still.
Up for sale, my used PSA AK-103 "Klone" rifles with zentico B10L handguards fitted/installed. Both will come with the original Pmag and Handguard. These are among the first batch of guns made. Both are in the 1600-1700 serial number range. Sights are straight and accurate...
I have had this in my safe for years now. 40 rnds through it. FN produced 12 inch cold hammer forged barrel. Carbine length gas system. 11 inch rail, PSA labeled, not sure who actually made it. PSA aluminum flip up sights. Griffin recoil comp, about 400 rounds have gone through it. The Lantac...
This is a take-off from a Brownells MK18 upper. Never fired, new condition. It should have the .070” gas port since it was purchased in 2019, post the gas port size change that DD did in mid-2017.
Comes with MK12 gas block and carbine gas tube installed.
Asking $300, willing to ship and...