I am interested in the ny1 and ny2 trigger springs. I did a search and couldn't find anyone asking my specific questions so decided to ask here. I'm sure this has been covered, but please cut me a break and help me out. My glock is a glock 19 3rd gen. 1. Are these different products when they come from different manufacturers or are they all identical? If they are different, which ones are the best? 2. Where is the best place to buy one of each spring for short money and from a reputable company? 3. Are they interchangeable with all glock models or is each gun have it's own specific trigger spring? 4. Can anyone give me a link to a video on the install on this product and tell me what tools, if any, that I will need? 5. Are there other trigger modifications that are better than the NY trigger spring systems? I am not looking for a lighter trigger, but rather a heavier one for carry. Thanks to all in advance for your help. This forum has been such a helpful place to learn about not just my new glock but many of my other guns. Thanks!