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inhen

Will an HK51 barrel fit a Madbull m4 updated ally receiver?

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Just ordered a cnc aluminium Madbull receiver set, an unusual crane stock I found on ebay Hong Kong and an ultimate hop unit. But whats next?

 

Will an HK51 barrel fit the receiver set?

 

Which stock tube will fit?

 

Most importantly what internals shall I go for?

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