1301 extension tube

[sup_nawh]

Is the longer spring even necessary?

The extension tube is plugged. Same amount of shells. What is the point of the longer spring?

 

[Grain]

Some people remove the plug, and then need the longer spring.

 

[Tommycanada]

Need the longer spring if you remove the plug, because even though the “spike” allows 1 more round.. the spring will still go to the end of the extension.. and stock spring will not have enough tension.