Had Teddy Jacobson do the 34 I use for IDPA SSP. Added only a Wolff 4 lb. striker spring. Don't like the mushy feel of the OEM 3.5 connector so use OEM 5 lb. one. No Ti parts. Can keep splits to .10 sec. or a little under which is faster than the Brain can follow. The 21 I use in CDP {for fun} has JP Enterprises Trigger Job on it with no 4 lb. Wolff spring {tried it but too light for own tastes}. Of the two this is the one I pefer for CCW {21 is most often carried Glock for CCW}. It does have a distinct SA feel {given it's a Glock!} that find I really like. Between the two if done over again would probably stick with the JP trigger.