GOOD QUESTION Everyone here seems to have a different opinion but the general consensus is between 23-25g and 1-1.5" long the length depends on your bodyfat and again preference. With Glutes I like 1" for Quads and delts 5'8" but that's me. Also I go 25g on all pins. here is what I do I Buy 3cc Luer lock syringes with 20g Pins and another box of 25g 1" pins only, then you can load the syringe fast and get straight to it. remember you don't have to put it in all the way so the 1" will cover you for all areas.
If I was to inject into my quad with a 1" needle, how far in do I push it?
The larger gauges will load faster you can push or oil out of the syringe with a small needle much faster than you can draw it in. The reason you change needles is because when it first punctures the rubber seal it dulls it down significantly. So when you're ready to pin your self it's like trying to do it with a dull nail lotsa guys don't change them but it goes much smoother and less painfully if you do
just a questions for us Vets... should we even be giving this guy advice... I mean I understand the nature of the forum to build knowledge and share advice. However, this guy is running gear with zero knowledge of what he is doing... I wouldnt be surprised if his shit he got is bunk and he gets staph at the end of his cycle.