Support BladeForums! Paid memberships don't see ads! Today I have a review of the Carothers Performance Knives Heavy Duty Field Knife (CPK HDFK, aka NASK). As per usual, you can read this review on my blog, but I have all of the pictures and content here too. The Carothers Performance Knives - Heavy Duty Field Knife (AKA: CPK HDFK) Introduction: This is a review of the newly released Carothers Performance Knives Heavy Duty Field knife (CPK HDFK), or if you hang out on the Carothers Performance Knives forum this knife is perhaps better known as the NASK, for Not A Survival Knife (a nickname derived from a desire to avoid confusion with Survive! Knives). This is a knife designed to be an indestructible heavy use knife that can be a one-knife solution for all your survival needs. While I am not a "one-knife-to-do-everything" kind of guy, I do enjoy reviewing survival knives. And of the knives I have reviewed and used in this class, none of them have performed better overall. This really is a superbly designed indestructible everything knife. I was fortunate enough to land one of the D2 Prototypes of the HDFK pattern. The D2 (Actually PSF 27, a spray formed version of D2 made by SBSM) prototype version differs from the regular production version in a few ways beyond the steel (the regular version will be in D3V). The blade is "Sterile" which means that it doesn't have the maker or designer marks that will be found on the regular production versions. Additionally, the "bark" was left on the sides of the blade for a less refined looking finish. I tend to prefer a more polished level of finish, but I have to admit the rugged finish looked pretty cool. The only marking on the blade was a simple D2 to let you know what steel this was made with. I only had two weeks to review this knife before I had to send it on to its permanent owner, but I made sure to give it a thorough workout. As one can see looking at this knife, the design legacy shares many elements with the CPK Light Chopper. But even though there is a great deal of visual similarity, this knife functions very differently in pretty much every type of use I put it to. The knife is also much smaller than the Light Chopper. As the company and designer of this knife are the same as my recent CPK LC review, I will quote myself: The knife is made by Carothers Performance Knives, which is headed by Nathan Carothers (and his wife Jo). Nathan Carothers is a very experienced machinist, with a vast materials knowledge, as well as a truly impressive capability at using CNC machining. He is also very willing to share his knowledge, I have learned a lot over the last year and a half or so paying attention to Carothers (Here is a BladeForums thread of people asking Nathan questions and him answering, it is educational and about 50 pages long). CPK is an exciting brand to pay attention to, but at the current time demand is far exceeding their production capability which makes it hard to get a lot of CPK knives. Sales for the Light Chopper (for example) are typically for 20 or so at a time, and they usually sell out in less than 5 seconds. The other option is to buy the knives on the secondary market (which is how I purchased the reviewed knife), but prices can vary dramatically, and availability is still limited. The knife was designed in cooperation with Lorien Arnold, a talented knife designer from British Columbia, Canada. Lorien cooperates with numerous knife makers, but has been partnering extensively with CPK recently. Sadly I can't afford the custom knives he designs, but I am a fan nonetheless. The TL;DR review summary: I do not know of a better quality survival knife, regardless of price. This knife really impressed me. For any given purpose there are better knife options available, but for an all purpose knife that can stand up to significant abuse, I have not used a knife that handles as many tasks as well as this one. Like any CPK knife, this one is hard to acquire, but it is well worth the cost and trouble if you are looking for a survival knife.