Wash the cucumbers, gently scrubbing to remove any spines. Cut the cucumbers lengthwise into quarters to form spears.
Dissolve 6 Tbsp. salt in 1 gallon of cold water.
Place the cucumbers in a bowl and pour the cold salt water over them. Allow them to soak for 24 hours.
Drain the soaking water and pack the cucumbers into wide-mouth pint jars. Trim off the cucumber if necessary to ensure they fit, leaving 1/2 inch headspace.
Add 1 tsp mustard seeds and 2 dill sprigs to each jar. Lacking fresh dill sprigs, you can add 1 tsp dried dill seed to each jar instead. Add pickle crisp if using at a rate of 1/8 tsp per pint jar.
At this point, prepare a water bath canner if canning.
Make the pickle brine by bringing the brine ingredients to a boil in a pot, stirring to dissolve the sugar and salt.
Pour the boiling brine over the top of the cucumbers in the jars, maintaining 1/2 inch headspace. Cap with 2 part lids.
If making refrigerator pickles, allow the jars to cool completely before storing in the refrigerator.
If canning, process the jars in a water bath canner for 10 minutes. Turn off the heat and allow the jars sit in the canner for an additional 5 minutes before removing them to cool completely on a towel on the counter.
Wait 12-24 hours , then check seals. Store any unsealed jars in the refrigerator and use first.
Properly canned and sealed jars of dill pickle spears will maintain peak quality on the pantry shelf for 12 months, and be safe to eat so long as they're sealed. Refrigerate after opening.
For the best flavor, allow the jars to sit for at least 1-2 weeks before enjoying, so they have time to properly developed a pickled flavor.