Harrison Design ignition parts are manufactured from top grade tool steel to provide precise fit and reliable, consistent function under the most demanding conditions. Each part is wire EDM'd and CNC machined for a precise +/- .0005" tolerance, heat treated to Rc 53 - 56, then honed and mirror polished to give Extreme Service in your pistol.
All of our hammers have a prepped full cock notch that's .020" deep and a captive half cock notch that's full width, per the original prints. It can be successfully installed in all 1911s whether having a firing pin safety or not.
The hammers are slightly narrowed to avoid unwanted contact with the slide or ejector. They have deep serrations to help you keep the hammer under control and all exterior corners are CNC machine beveled to minimize snagging and abrasion.
The Concealed Carry hammer with it's "teardrop-shaped" hammer hole has a rowel section (the rounded area with the serrations) that is slightly smaller to the rear and to the underside, making it work correctly and look good on pistols using a beavertail with a reduced-size "tail". It works especially well with the Harrison Design Retro hammer, the Wilson Combat "Carry" beavertail as well as Springfield beavertails that were paired with their "Delta" hammer.
I do not advertise my parts as drop-in. There are just too many variables in dimensions and tolerances between frames and the associated parts involved to really make that claim and it be true. I always try to under promise and over deliver with Harrison Design products. You should be able to obtain a satisfactory trigger pull with these parts but any or all of these standard jobs that are involved in a 1911 trigger job are to be expected and must be dealt with satisfactorily. This includes checking &adjusting the parallelism of pin holes and their squareness to the frame, checking & adjusting the diameter of sear and hammer pins and their fit to those parts, checking and adjusting for even bearing contact on both hammer hooks with sear nose, checking and adjusting for adequate engagement in the depth of sear nose to hammer hooks, adjusting correct tension setting of sear spring leaves, checking for adequate take-up resulting in correct operation of captive half-cock notch and any adjustment necessary to ensure it’s correct operation, correct operation and adjustment of over travel stop, correct operation and re-fitting of thumb safety, correct operation and re-fitting of grip safety, correct operation and adjustment of any firing pin blocking safety system.