Anderson Manufacturing AR-15 Lower Parts Kit - Stainless Hammer and Trigger

It is not a J-pin inside the hammer that is missing, rather it was a J-spring.

I am changing my previous review from 5 stars to 4 stars. It seemed everything was working great until I noticed the pin on the hammer was slowly walking out. Upon inspection, I found out the J-pin inside the hammer was missing. The J-pin sits in the middle grove of the pin preventing it from moving left or right.

Just installed the kit to my stripped lower, did not encounter any problem. The trigger releases smoothly without any take up and the reset was great. The selector was tactile, it shifts from safe to fire and vice versa with a nice sounding click.

This is my Third build using this Anderson LPK. Perfect fit with my Spikes, Aero and FN Lower. QC on this LPK is excellent. I would invest on these instead of those Palmetto PSA LPK

I use this LPK in all my builds.Paired with a 3.5# spring kit it is truly amazing.

Personally, I think this is the best LPK on the market. The trigger is what stands out...it's worth $40 by itself. Out of the box, the trigger measured exactly 5lbs on my Wheeler Professional, with a short takeup and crisp break. However, I then paired it with a $10 JP Enterprises spring kit, and now it's measuring at 3.4lbs and feels even better. I've used CMC triggers for years, and this is every bit as good for under $50 ($40 if you buy the trigger alone). The rest of the parts are fine...they aren't anything special or fancy, but they fit great and they do the job. I've installed these on about 20 different builds, though admittedly most of them were with Anderson lower receivers, and have never had fitment issues. If you just need a basic mil-spec kit and/or want a gem of a trigger, look no further.

The kit is packaged nicely. The hammer I received had a broken J spring, so the hammer pin was walking out. I emailed Primary Arms, and they had Anderson send me a non-defective hammer. The trigger pull is very short and crisp for mil-spec. Selector is tight, but I kind of like it. Only the front pivot pin is dimpled, not the takedown pin, which is weird to me. Overall, decent.

Having purchased and installed many of these Anderson LPKs, I can confidently state that anyone who has issues installing LPK this needs to stick to their Lego's and leave the smithing to those of us who know what we are doing. Milspec is milspec, not perfection in a box. Drop in parts are not always drop in. Compared to working on 1911's, installing AR parts is a breeze.

Enough said. Buy this kit, you will like it.

I wish I had read some of the reviews for The skit before purchasing. I generally purchase Aero lower kits. The one I liked was not in stock, so I went with this kit. Bolt catch spring did not fit. Ended up ruining the spring trying to fix it. Now I have to order another bolt catch spring before I can go any further. Won't be ordering anything else from Anderson

This is a decent kit which I installed into an Aero lower with a JP spring kit. All the parts look well machined but I ran into an issue with the hammer. Once installed the hammer would not move without considerable force. I had to sand down and polish both sides that have the slot for the trigger pin. A few minutes of work and this is a solid kit. I will buy again if on sale.