I did a remix of niltsh (https://makerworld.com/en/u/1906626152) awesome Hybrid Crossbow. When I initially built his model, the hand grips wear very tight due to tolerance and I ended up having to enlarge it to 100.5% to get it to fit correctly. After the build, my son asked if I could mount a rifle style hand grip so his fingers would not catch the string when he launched the balls. Well, with some simple modification, I developed a new hangrip style for him.

MODS to original:

Hand grip modification

enlarged upper and lower grips to 100.5% for easier install.

niltsh posted a great step by step install slide on his site. https://makerworld.com/en/models/142373#profileId-155031

Items i purchase on US Amazon to make the Crossbow.

https://www.amazon.com/dp/B088QLQL27?ref=ppx_yo2ov_dt_b_product_details&th=1

https://www.amazon.com/dp/B08XYMX5HS?ref=ppx_yo2ov_dt_b_product_details&th=1