Although the Kel-Tecs are fine guns stock out-of-the-box, the following is a compilation of accessories, updgrades, and modifications to make these little guns even better. This list is based on what most owners in KTOG have done to their guns. Unlike "customizing" and "gunsmithing" on other guns (e.g., Colt 1911-type pistols), these won't cost you an arm and a leg. As one KTOGer put it: "You'll have a $400-plus gun for a whole lot less money."
8.5-pound hammer spring (p/n P11-275)
If your Kel-Tec P11 is prior to the serial number 23xxx to 28xxx range, there's a good chance that you have the original 10-pound hammer spring installed in your gun (Kel-Tec CNC can verify for your which hammer spring is in your gun). Probably the single biggest "criticism" of the P11 is the long, hard DAO trigger pull. There's not much you can do to make the trigger pull shorter, but you can certainly make it easier by replacing the 10-pound spring with an 8.5-pound spring. If you feel comfortable completely disassembling your gun (fortunately, the P11 is a relatively "simple" gun with not a lot of parts), you can replace the hammer spring yourself (visit TecWerks for complete how-to instructions). But if you're unsure of your abilities, Kel-Tec CNC will replace the spring without charging you any labor (just the cost of the spring).
Trigger shoe (p/n P11-392)
The trigger shoe creates a wider surface for your finger to rest on and pull, resulting in a more comfortable trigger. Combined with the 8.5-pound hammer spring, this makes a BIG difference. The trigger shoe is easy to install via two set screws. Several people have reported that the trigger shoe can fall off after extended use. Some members of KTOG have countersunk holes in the side of their triggers (i.e., drilled tiny little holes for the set screws) to ensure a secure fit. Others have actually used Crazy Glue or some other wonder adhesive to bond the shoe to the trigger (NOTE: if you do this, you won't be able to completely disassemble your gun). In either case, be sure to use some medium strength Loctite (blue) or some other thread compound to make sure the set screws don't work loose.
LaFrance trigger job.
This is an easy do-it-yourself trigger job that greatly smoothes out the P11/40's trigger pull. The trigger action will still be long, but S-M-O-O-T-H as silk kind of like a good double action revolver trigger. In conjunction with the 8.5-pound hammer spring and trigger shoe, you won't know it's the same gun! Visit TecWerks for complete how-to instructions.
This will help ensure that your P11/40/32 digests almost any kind of ammo. Kel-Tec CNC will do this for you for free if you send your gun to them (all you have to do is ask), but this is something that can be easily accomplished yourself with a Dremel tool and jeweler's rouge. Simply remove the barrel by field stripping your P11, apply a little jeweler's rouge to a felt polishing tip, and polish away with a Dremel tool (kind of liking waxing your car, but at 20,000 rpms). When you finish, the feedramp should be smooth, slick, and shiny. To help make the feedramp even slicker, several KTOGers also apply a drop of Militec-1 to the feedramp.
Magazine finger extension (p/n P11-045).
Unless you have really small hands, you probably won't be able to get a full 3-finger grip on the little P11. This is easily solved with the addition of the magazine finger extension which replaces the magazine baseplate on the factory (MecGar) 10-round magazines. Some say the Kel-Tec extension isn't as "elegant" as the Pearce grip extension for the mini-Glocks (G26 and G27), but it's easy to install and 100% functional.
Hogue Handall Jr. slip-on grip
If you don't like the feel of the P11/40's plastic checkering or want to take a little bit of the bite or sting out of the gun, the Hogue Handall Jr. slip-on grip is just the ticket. This is a soft rubber grip with finger grooves and palm swells. Some members of KTOG have found the Handall Jr. to be exceptionally tight and difficult to install. oaking the grip in hot water or using soap and warm water usually makes installation a piece of cake. Another method is to use a tongue depressor or some other wide "popsicle stick" to help slide the grip on. The Hogue Handall Jr. seems to be the slip-on grip of choice for most Kel-Tec owners, but both Uncle Mike's and Pachmayr make similar rubber grips that would also probably work just as well.
Other Neat Stuff
Belt clip (p/n P11-380)
Regardless of why you invest in it, as an accessory or as an inexpensive holster; the Kel Tec Belt Clip is a bargain. Available from Kel Tec (PN P-11-380) for $12.75 in black or fifty cents more for stainless, the belt clip is an item that all P-11 owners should have.
The belt clip fastens unobtrusively to the right hand side of the weapon with provided pins that replace two of the three pins holding the P-11 together. The original pins press out easily and the belt clip pins slip in and are held firmly in place by end caps. The belt clip, in turn, screws into the end caps on the right side of the weapon. Installation is simple and fast and only requires Loctite on all threaded surfaces to hold firm for the long term. Without Loctite, the clip will shake off in 25-50 rounds of practice firing.
The clip does not interfere with shooting and holds the weapon firmly onto a standard thickness dress belt with the gun inserted inside the waistband. The P-11/40 is so small, that belt clip wear is relatively comfortable and the clip holds firmly enough to keep the gun in place, yet yields an easy release when drawing the weapon. It is much superior to inexpensive nylon holsters in control and close in comfort. There is no additional bulk created by holster dimensions when using the clip; and many times a shirt can be bloused over the weapon, enhancing concealment. Worn under an outer garment, the weapon is almost impossible to detect. The belt clip holds firmly enough to allow relatively vigorous activity without losing the weapon. You can run or jog with the gun in this carry method and are limited by the clothing, and not the weapon or this carry method when exercising.
High capacity magazines
One of the attractive features of the Kel-Tec P11/40 is its ability to use Smith & Wesson M59-series (15-round) and M69-series (12-round) magazines. Many KTOGers are partial to the M69 12-round magazines and use them as spares when they carry. Depending on your body size and type and your mode of carry, it's also possible to use the M69-series magazine (with extension - see below) as your primary magazine in your gun. Most people seem to find the M59-series magazine just too long for use as anything except as a spare or at the range.
Be sure to use the most recent M59- and M69-series magazines; older models, especially first generation, will not work in the P11. And while the S&W magazines seem to work without a problem in the P11/40, it can be hit-or-miss with other brand (e.g., USA, Pro Mag) aftermarket high-capacity magazines. While you might be able to save a buck or two using non-S&W high-capacity magazines, you may find that they won't work properly or 100% of the time.
One good source for S&W full capacity magazines is CDNN.
P.O. Box 6514
Abilene, TX 79608
Fax (915) 695-4898
Both the M59-series and M69-series magazines extend below the grip. Fortunately, Kel-Tec makes magazine extensions that slip over the magazine which create a full grip. The M59-series magazine extension is p/n P11-043. The M69-series magazine extension is p/n P11-044 (NOTE: this part is not listed in the "Pistol Accessories" supplied with your P11/40 or on Kel-Tec CNC's web page).
Steel vs. Polymer
There is some question regarding the long term reliability of the polymer guide rod in the P11 and Kel-Tec CNC has made a steel guide rod available (p/n P11-195 steel). The prime motivation for this accessory is market orce and not reliability in the P11. There has not been a reported rash of polymer guide rod failures on P11s; however, there have been a lot of polymer rod failures on Glocks and we live in a world where many users have both weapons. It should be noted that most Glock polymer guide rod failures are not breakage failures. Rather, the Glock polymer guide rod can flex sufficiently under recoil such that there is not enough slide velocity and the gun fails to go into battery. Apparently, this is not that uncommon a problem and many Glock owners replace the stock polymer guide rod with a metal aftermarket rod. There have been no reports of a similar failure to go into battery problem that can be traced to the polymer guide rod in the P11.
There is one significant difference between the Glock and P11, and that is the frame, which is aluminum on the P-11 and a steel insert on the Glock. Using a steel rod on the P11 can potentially cause frame damage with "hot" loads because the frame can gall or be abraded by collision with the harder material of the steel guide rod. There has been no report of significant damage done to a P11 by the steel guide rod, although some users have had to polish the steel rod to reduce spring friction and eliminate frame abrasion.
Kel-Tec CNC has taken a neutral stand on this issue stating that the polymer rod should last the life of the gun. They also state that the steel rod is unquestionably stronger. However, there is no apparent technical or reliability reason to use the steel rod. Users can make their own choice.