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Welcome to GMAC Custom Parts Ltd...


GMAC Update: 21/12/20

For those that do not know my father Gordon MacMillan, 'Mr GMAC' who started this company over ten years ago through his passion for guns and in particular Crosmans, he has sadly died earlier this year just before the Covid 19 lockdown. We had together started on an updated website, with new products and I hope to have this finished soon. I will be continuing with his work and I have a list of his ideas and new parts that he was designing. This is along with my own ideas and the welcomed input from customers, I will continue to bring new parts to the market.

I now work on my own so, I will have to answer all emails, phone calls, package orders and run the workshop by myself so, please be patient with me, whilst I get everything in order. 

Last shipping date before Christmas is 23/12/20 make sure your order is in by tomorrow night (22/12/20) to ensure it is shipped.

I will be closed from the 23rd so all orders after this date will be shipped on the 29th and 30th December then closed again until 04/01/21 where it wil be back to normal.

Merry Christmas and Happy New Year.





We are a family run business with the personal touch manufacturing and supplying custom made parts for the Crosman 22xx & 13xx range Marauder BP2220, Crosman 1720T, Silhouette 1701P, 1077, Benjamin Discovery, Maximus and the QB/XS78 range, Webley FX2000 and its derivatives.

Most of our parts are made in brass a traditional material used by gun makers for centurys and Anodised Aluminum don't expect anything on this site made by GMAC to be made in  Delrin, the whole idea is to replace the plastic parts All Crosman spare parts listed are genuine not  GREY IMPORTS  Based in the UK but welcome orders from overseas all stock items posted within 24 hours of payment on business days.