Check with Doug Jamison at Shuck Implt in Lawrence Ks. 800-654-5191 I just got a 1650 gas block and he was $200 dollars cheaper than anyone. I have also gotten a lot af parts from Tom at O'brien county implt 712-324-4871 and the there is jobbersinc.com 215-236-8500 ask for Mark or Jimmy Good Luck Ralph