An tsara ƙarfin matse bututun. Babu wani nau'in matse bututun da yake da kyau, sai waɗanda suka dace. Idan buƙatar ƙarfin matse bututun ya fi matse bututun Amurka kuma ya fi ƙanƙanta fiye da matse bututun ƙarfe, ana iya zaɓar matse bututun Jamus!

Kwatanta halaye tsakanin maƙallan bututun ruwa na Jamus da maƙallan bututun ruwa na Amurka:

1. Zaren da ke kan bel ɗin ƙarfe na maƙallin bututun Amurka yana cikin ramin rami, yayin da nau'in Jamus ɗin tsohon concave ne;

2. Faɗin bakin ƙarfe na Amurka shine 12.7MM, ƙaramin Ba'amurke shine 8MM, (daidai yake da kuma ƙasa da 27 shine ƙaramin Ba'amurke, sauran kuma babban Ba'amurke ne), kuma Ba'amurke shine 9MM da 12MM;

3. Hexagon kan sukurori na maƙallin bututun Amurka shine 8MM, kuma nau'in Jamus shine 7MM;

Kwatanta fa'idodi da rashin amfanin maƙallan bututun ruwa na Jamus da maƙallan bututun ruwa na Amurka: Farashin maƙallan bututun ruwa na Amurka ya yi ƙasa da na maƙallan bututun ruwa na Jamus. A lokacin amfani, saboda maƙallan bututun ruwa na Jamus ba tsari ne mai haske ba, ƙasa tana fesawa a kan maƙallan bututun ruwa na Jamus. A sama, maƙallan bututun ruwa na Jamus yana da wahalar sassautawa, yayin da maƙallin bututun ruwa na Amurka ba ya shafar maƙallin.